Light: Mirrors and Lenses Class 8 Worksheet with Answers Science Chapter 10 - #NCSOLVE 📚

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Class 8 Science Chapter 10 Light: Mirrors and Lenses Worksheet

Class 8 Light: Mirrors and Lenses Worksheet

Worksheet On Light: Mirrors and Lenses Class 8 – Light: Mirrors and Lenses Worksheet Class 8

A. Objective Type Questions

Multiple Choice Questions

Question 1.
Which of the following option is correct regarding necessity to see an object?
(a) There must be a source of light.
(b) The light must strike the object.
(c) The light must be reflected from the object to the eye.
(d) All of the above
Answer:
(d) All of the above

Question 2.
Angle of incidence for a plane mirror is 30°. What will be the angle between incident and reflected ray?

(a) 30°
(b) 60°
(c) 90°
(d) None of these
Answer:
(a) 30°

Question 3.
The distance of object placed before a plane mirror is 5 cm from the mirror. What will be the distance of image from the plane mirror?
(a) 5 cm
(b) 10cm
(c) 15 cm
(d) 20 cm
Answer:
(a) 5 cm

Question 4.
The diagram shows a ray of light reflected at a plane mirror. Which of the angles of incidence and angles of reflection are correct?

Angle of Incidence	Angle of Reflection
(a) 30°	30°
(b) 30°	60°
(c) 60°	30°
(d) 60°	60°

Answer:
(a)

Question 5.
Following figure represents reflection of light, which of these depicts diffused reflection?

Answer:
(b)

Question 6.
The diagram below shows a ray of light being reflected from a place mirror. Which of the labelled angles are the angle of incidence and the angle of reflection?

Angle of incidence	Angle of Reflection
(a) 1	2
(b) 2	3
(c) 1	4
(d) 3	1

Answer:
(b)

Question 7.
Which of the following demonstrates the law of reflection?

Answer:
(d)

Question 8.
Which of the following are the properties of a plane mirror image?^
1. The image is at the same distance as the object.
2. The image is upright.
3. The image is laterally inverted.
(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3
Answer:
(d) 1, 2 and 3

Question 9.
Two girls are standing in front of a plane mirror as shown. When girl A looks into mirror, how far away from her will image of girl B seem to be?

Answer:
(d)

Question 10.
Garima is studying about the characteristics of image formed by a plane mirror. Which of the following diagrams correctly show the image of a plastic ruler in a plane mirror?

Answer:
(c)

Question 11.
The experiment in the diagram shows that

(a) light rays are very thin
(b) a beam of light is made up of lots of light rays
(c) light rays travel in straight lines
(d) the eye can only see in a straight line
Answer:
(b) a beam of light is made up of lots of light rays

Question 12.
A student looks through a lens and sees an image that is upright, smaller, and appears inside the lens. Which type of lens is she likely using?
(a) Convex lens
(b) Concave lens
(c) Plane glass
(d) Prism
Answer:
(b) Concave lens

Question 13.
A person uses a lens to read small letters in a book. The image appears bigger and upright. What kind of lens is likely being used?
(a) Concave lens
(b) Convex lens
(c) Plane mirror
(d) Biconcave lens
Answer:
(b) Convex lens

Assertion-Reason Questions

The questions given below consist of an Assertion and a Reason. Based on that choose the correct option.
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) Assertion is true, but Reason is false.
(d) Assertion is false, but Reason is true.

Question 1.
Assertion: Passenger-side mirrors on cars are made slightly convex.
Reason: Convex mirrors give drivers a wider field of view.
Answer:
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

Question 2.
Assertion: When you hold a magnifying glass very close to small text, the letters appear larger and upright.
Reason: A convex lens produces an enlarged virtual image when the object is nearer than the lens’s curved surface allows for a real image.
Answer:
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

Question 3.
Assertion: A sharper shadow is formed when the light source is small and close to the object.
Reason: A small light source produces nearly parallel rays, so the edges of the shadow are more distinct.
Answer:
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

Question 4.
Assertion: A plane mirror always forms a virtual, erect, and laterally inverted image.
Reason: Curved-inward shape makes reflected rays converge before they reach your eye, magnifying the image.
Answer:
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

Question 5.
Assertion: Left and right get swapped when you look at yourself in a mirror.
Reason: The image formed by a plane mirror is real and inverted.
Answer:
(c) Assertion is true, but Reason is false.

Fill in the Blanks

Question 1.
Fill in the blanks.
(a) In a plane mirror, the image appears to be located ___________ the mirror.
Answer:
behind

(b) A convex mirror always produces an image that is ___________ than the object.
Answer:
smaller

(c) Lateral inversion happens because the mirror does not flip the image ___________ to bottom.
Answer:
top

(d) When a light ray strikes a smooth surface and bounces off, this is called ___________.
Answer:
reflection

(e) The incident ray, reflected ray, and the normal all lie in the same ___________.
Answer:
plane

(f) A lens that makes parallel light rays spread apart is called a ___________ lens.
Answer:
concave

Question 2.
Complete the following paragraph explaining lateral inversion:

Lateral inversion is the (a) ___________ reversal of an image in a plane mirror. It occurs due to the reflection of light following the (b) ___________ of reflection. The image is virtual, erect, and the same size as the object, but the left side of the object is seen on the (c) ___________ in the image. For example, when you stand facing a mirror, your right ear appears as the (d) ___________ ear in the image. This effect is used in the writing on an ambulance, which is written with (e) ___________ inversion so that it appears normal when seen in a (f) ___________ mirror. The top and bottom of the image (g) ___________ inverted.
Answer:
(a) left-right
(b) laws
(c) right
(d) left
(e) lateral
(f) rearview
(g) are not

True/False

Question 1.
State whether the following statement are true (T) and false (F).
(a) Lateral inversion occurs only in plane mirrors.
Answer:
False

(b) Cinema projectors use convex mirrors.
Answer:
False

(c) The angle of reflection is measured between the reflected ray and the mirror surface.
Answer:
False

(d) Convex mirrors make objects appear larger.
Answer:
False

(e) In a convex mirror, the image is always upright and reduced in size, no matter the object’s position.
Answer:
True

(f) The image formed by a convex lens can never be real.
Answer:
False

Question 2.
Put the correct (✓) and incorrect (✗) markings for each statement:
(a) The angle of incidence for a plane mirror is 10°. Angle between normal and reflected ray will be 20°.
Answer:
✗

(b) Light sometimes travels in straight line and sometimes it follows a curved path.
Answer:
✗

(c) Angle of incidence is always equal to angle of reflection.
Answer:
✓

(d) A reflected light from a plane mirror can’t be reflected again.
Answer:
✗

(e) A converging lens can focus parallel rays of light to a point.
Answer:
✓

(f) Laws of reflection are valid for all the reflecting surfaces.
Answer:
✓

Match the Following

Question 1.
Match given terms with their correct explanation.

Image Description	Mirror Type
(a) Image is always smaller and erect	(i) Convex mirror
(b) Image is real, inverted, and large	(ii) Concave mirror
(0 Image is upright, same size	(iii) Plane mirror
(d) Image is formed behind the mirror	(iv) Both 2 and 3

(a) ___________
(b) ___________
(c) ___________
(d) ___________
Answer:

Image Description	Mirror Type
(a) Image is always smaller and erect	(ii) Concave mirror
(b) Image is real, inverted, and large	(i) Convex mirror
(0 Image is upright, same size	(iii) Plane mirror
(d) Image is formed behind the mirror	(iv) Both 2 and 3

Word Identifications
(a) _ _ N _ _ _
Hint A mirror that bulges outward and always forms virtual, diminished images.

(b) R _ _ _ _ _ _ _ _ _
Hint Bouncing back of light from a surface like a mirror.

(c) _ _ _ _ E _
Hint This lens is thinner at the edges and thicker at the center.

(d) _ _ _ _ _ _ _ _ _ _ _ _ I _ _
Hint A rule that states the angle of incidence equals the angle of reflection.

B. Subjective Type Questions

Define the Following Terms

1. Reflection
_________________________________

2. Lateral inversion
_________________________________

3. Spherical mirror
_________________________________

4. Law of reflection
_________________________________

5. Angle of incident
_________________________________

Give Reason for the Following

1. We are able to see objects in a mirror even though the objects are not behind the mirror.
_________________________________

2. Mirrors used in torch lights and headlights are curved instead of flat.
_________________________________

Very Short Answer Type Questions

Question 1.
Name the following in the given figure marked as A, B, C and D.

_________________________________

Question 2.
Angle of reflection for a plane mirror is 0. What should be the angle between normal and plane surface of the mirror?
_________________________________

Question 3.
If a mirror reverses left and right, why doesn’t it reverse top and bottom?
_________________________________

Question 4.
Name the point on a mirror where the incident ray meets the surface.
_________________________________

Question 5.
A child looks at herself in a spoon and notices the image is upside down. Which part of the spoon is she looking at and why?
_________________________________

Question 6.
How can you prove that the angle of incidence is always equal to the angle of reflection without using a protractor?
_________________________________

Question 7.
Which lens diverges parallel rays of light?
_________________________________

Question 8.
Why do opticians use concave mirrors to examine patients’ teeth?
_________________________________

Question 9.
What is the angle of incident and reflection in the given image?

_________________________________

Question 10.
Which lens is used in a magnifying glass?
_________________________________

Short Answer Type Questions

Question 1.
Aryan looks into a mirror labelled X in a shopping mall. No matter how far he moves, his image always appears smaller and upright. Identify what X is and give one reason to support your answer?
_________________________________
_________________________________
_________________________________

Question 2.
Describe how the size and distance of an image in a plane mirror relate to the object’s size and distance?
_________________________________
_________________________________
_________________________________

Question 3.
Complete the flowchart of mirror.

(i) ___________
(ii) ___________
(iii) ___________
(iv) ___________
(v) ___________
(vi) ___________

Question 4.
State two laws of reflection.
_________________________________
_________________________________
_________________________________

Question 5.
How does the law of reflection help you determine the path of a reflected ray on a mirror?
_________________________________
_________________________________
_________________________________

Question 6.
A student places a lens in sunlight and it focuses the light to burn a paper. What kind of lens is that?
_________________________________
_________________________________
_________________________________

Question 7.
Why do side-view mirrors on cars often carry the warning “Objects in mirror are closer than they appear”?
_________________________________
_________________________________
_________________________________

Question 8.
Two plane mirrors AB and CD are placed at right angles to one anothfift-A ray of light PQ hits mirror AB at Q making an angle of 45° a shown in figure:

Complete the diagram below by showing how ray PQ will bend after reflection at the mirrors AB and CD?
_________________________________
_________________________________

Question 9.
Why is it difficult to use a concave lens as a magnifier?
_________________________________
_________________________________
_________________________________

Question 10.
You notice that the glass in a peephole of a door makes people look smaller. What kind of lens is likely used?
_________________________________
_________________________________
_________________________________

Long Answer Type Questions

Question 1.
Tommy visits an optician to get his eyes tested. The optician leads Tommy to a small room where he is asked to read out some letters:

(a) Why do you think the optician wants Tommy to look at the letter chart through the mirror rather than directly?
_________________________________
_________________________________

(b) What is the key difference between the optician’s letter chart and one that Tommy used to read in book?
_________________________________
_________________________________

(c) How far from Tommy’s eyes do the image of the letters in the mirror appear to be?
_________________________________
_________________________________

(d) Are the images of the letters in the mirror is equal in size to the letters on the actual chart?
_________________________________
_________________________________

(e) If Tommy moves back by 1 m from where he is seated as shown in the picture, how far are his eyes from the images of the letters in the mirror now?
_________________________________
_________________________________

Question 2.
A makeup mirror often has two sides—one flat and one magnifying,
(a) Which type of mirror is used on the magnifying side?
_________________________________
_________________________________

(b) Why does the magnifying mirror make it easier to apply eyeliner?
_________________________________
_________________________________

(c) How does the image formed by the magnifying side differ from the flat side?
_________________________________
_________________________________

Question 3.
A character, “Ray the Light Beam”, is trapped inside a magical room. The room has different objects on the walls marked X, Y, and Z:
(a) Wall X shows a clear, same-sized image when ray hits it.
_________________________________
_________________________________

(b) Wall Y curves outward and always shows a small image.
_________________________________
_________________________________

(c) Wall Z is curved inward and can make a large image if ray comes close.
_________________________________
_________________________________

Question 4.
Ray needs to find his way out, but the exit only opens when he hits the object that follows the law of reflection and produces lateral inversion.
(a) Explain how a dentist’s mirror (a small plane mirror) helps view the back teeth?
_________________________________
_________________________________

(b) Describe the role of lateral inversion and image location.
_________________________________
_________________________________

(c) Mention any ergonomic advantages or challenges of using such mirrors.
_________________________________
_________________________________

Case Based Questions

Tina was helping her younger brother write the word “AMBULANCE” on a toy car. Her father told her that the word must be written in a special way so drivers ahead can read it correctly through their rear-view mirrors. Tina found it strange that the letters had to be flipped.

Question 1.
Why does the writing on the toy car appear correct when seen through a mirror in front of it?
(a) Because of the bending of light
(b) Due to change in light speed
(c) Because of sideways flipping of image
(d) Because the mirror enlarges letters
Answer:
(c) Because of sideways flipping of image

Question 2.
Which type of mirror would a car’s driver most likely use to read the flipped writing on a car ahead?
(a) Concave
(b) Plane
(c) Convex
(d) Transparent
Answer:
(b) Plane

Question 3.
The mirror shows the object at the same distance and size, but flipped. What kind of image is this?
(a) Real and upside down
(b) Enlarged and virtual
(c) Smaller and inverted
(d) Same size and virtual
Answer:
(d) Same size and virtual

Question 4.
A bus has a shiny curved mirror on the outside that allows the driver to see a wide area behind. Riya notices that the image in the mirror is small and covers more of the road. Her teacher explains that it’s a special mirror that diverges light rays.

(a) What type of mirror is used on the bus?
_________________________________
_________________________________

(b) Why does it show a wider view but smaller images?
_________________________________
_________________________________

(c) How is this mirror different from a concave mirror?
_________________________________
_________________________________

Skill Based Activities

Question 1.
(i) Unscramble the jumbled words.
(a) RRIMRO ___________
(b) LAERTAL IIRNVESON ___________
(c) NOCXVE ___________
(d) EVACNOC ___________
(e) NCIDINET YAR ___________
Answer:
(a) RRIMRO → MIRROR
(b) LAERTAL IIRNVESON → LATERAL INVERSION
(C) NOCXVE → CONVEX
(d) EVACNOC → CONCAVE
(e) NCIDINETYAR → INCIDENT RAY

(ii) Answer the riddle given below.
I always turn your left into right,
Yet I show you clear and bright.
I form no real image, you see
What kind of mirror could I be? ___________
Answer:
Plane Mirror

Question 2.
When viewed through a mirror, the letter ‘A’ remains unchanged. However, the letter ‘B’ is laterally inverted and becomes fl.
(a) Encircle the alphabets that remain unchanged when viewed through a mirror.

_________________________________
_________________________________
Answer:
A, H, I, M, O, T, U, V. W, X, Y

(b) Look at the following sentences which have been written using^mirpor writing, Decode the sentence.

_________________________________
_________________________________
Answer:
I am learning to mirror write
THIS IS A MIRROR WRITING SAMPLE.
DO YOU THINK THIS IS A GOOD WAY
TO HIDE THE SECRET MESSAGES?”

3. There is a mistake in each of the following ray diagrams given in Figure a, b and c. Make the necessary correct.

_________________________________
_________________________________
Answer:
Figure (a)
Mistake The reflected ray is not equal in angle to the incident ray.
Correction Adjust thq angle r so it is equal to angle i, measured from the normal.

Figure (b)
Mistake The normal is incorrectly drawn—it is not perpendicular to the mirror surface.
Correction Draw the normal at 90° to the mirror surface, then ensure angle i = r.

Figure (c)
Mistake The reflected ray is on the same side as the incident ray, which is not possible.
Correction The reflected ray should go to the opposite of the normal.

Question 4.
Take a thick sheet of cardboard and cut it into a circle of about 15 cm in diameter. Divide the circle into two equal halves using a pencil. On one half, paste a small convex mirror (such as a cut piece from an old reflective toy or mirror sticker). On the other half, paste a convex lens (you can use amagnifying glass or lens from an old torch). Now, hold the cardboard in front of various objects like a candle, a pen, your face, or a window. Observe the images formed in both the mirror and the lens.

What do you observe in each case? Write your observations about:
(a) The size and orientation of the images.
_________________________________
Answer:
Convex Mirror: The image is smaller in size and upright (erect).
Convex Lens: The image size varies based on distance.

• If the object is very close, the image is larger and erect.
• If the object is farther, the image becomes inverted and smaller.

(b) Whether the images are real or virtual.
_________________________________
Answer:
Convex Mirror: Image is always virtual and erect.
Convex Lens: Virtual and erect when object is closer than the focal length.
Real and inverted when the object is beyond focal length.

(c) Any difference in the clarity of the image when you move the cardboard closer or farther from the object
_________________________________
Answer:
Convex Mirror: The image beomes smaller and less clear as the object moves farther away.
Convex Lens: The clarity changes significantly

• When at proper focus, the image is clear.
• Out of focus the image becomes blurry.

The post Light: Mirrors and Lenses Class 8 Worksheet with Answers Science Chapter 10 appeared first on Learn CBSE.

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