Light Test

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Light Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

An object of $$10 cm$$ is placed in front of a plane mirror. The height of image will be ....... .

A
$$5 cm$$

B
$$15 cm$$

C
$$20 cm$$

D
$$10 cm$$

Solution

The plane mirror forms same size image as the object and it is erect, laterally inverted and at the same distance as the object from the mirror. Hence the height of the image will be $$10$$ cm only.
Question 2
1 / -0

Which statement is wrong from the following for the reflection by plane mirror?

A
The size of image is same as size of object

B
Object distance and image distance is same

C
A plane mirror forms virtual and erect image

D
Image of the object in not laterally inverted
Solution
The characteristics of the image formed by a plane mirror is that:
The size of image is same as size of object
Object distance and image distance is same
Image formed is virtual and erect
image is laterally inverted
Hence, the statement in option D is wrong. So Option D is the answer.
Question 3
1 / -0

Riya and Priya were sitting around a round table. They noticed that they could see their own and each other's image onto the table top. Then table top is made of

A
Unpolished wood, covered with white cloth

B
Polished glass of red colour

C
Glass covered with cellophane paper

D
Smoked glass covered with green colour cloth.

Solution

A polished glass of red colour reflects most of the light incident on it so images of both persons are formed on it.
Question 4
1 / -0

Reflection is

A
Bending of ray of light.

B
Bouncing back of ray of light.

C
Light travelling in a straight line.

D
None of these.

Solution

Reflection is bouncing back of ray of light by a surface.
Question 5
1 / -0

A plane mirror reflects, a pencil of light to form a real image. Then the pencil of light incident on the mirror is

A
Parallel

B
Convergent

C
Divergent

D
None of these

Solution

When a converging beam incident on a plane mirror, a real image is formed as shown.
Question 6
1 / -0

At an instant a watch shows time $$3:25$$. When seen through a mirror, time appeared will be:

A
$$8:35$$

B
$$9:35$$

C
$$7:35$$

D
$$8:25$$

Solution
Question 7
1 / -0

A plane mirror:
(i) can form real image of a real object
(ii) neither converges not diverges the rays
(iii) cannot form real image of a real object
Choose the correct option or options.

A
(i) is correct

B
(i) and (ii) are correct

C
(ii) and (iii) are correct

D
None of the above
Solution
- Plane mirrors always produce virtual images, because they never focus light into a single converging point.
- Hence it does not produce real object or image
- As power of the plane mirror is zero, hence, it neither converges nor diverges the rays.
- Hence the option C is the right answer
Question 8
1 / -0

A diminished virtual image can be formed only in:-

A
plane mirror

B
A concave mirror

C
A convex mirror

D
Concave-parabolic mirror.

Solution

A diminished virtual image can be formed only in a convex mirror because convex mirror is diverging in nature and an any ray that passes through it appears to meet at a point but do not converge in reality, hence giving rise to virtual image.
The correct option is C.
Question 9
1 / -0

Select the correct alternative:
The property due to which a light ray striking a surface and returned back into the same medium is called

A
refraction

B
reflex action

C
reflection

D
regression

Solution

The property due to which a light ray striking a surface and returned back into the same medium is called reflection.
Question 10
1 / -0

Mirror used as rear view mirror is

A
Plane

B
Convex

C
Concave

D
Either convex or concave

Solution

The type of mirror used in the rear-view mirror must be convex mirrors, because it creates smaller, yet still upright images. Concave mirrors would create an inverted image and the cars you see are not upside down. Convex mirrors make everything smaller so this allows us to see a greater range of things behind while sitting in the car.
The plane mirror forms images of objects of the same size and covers less area as compared to the convex mirror.

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Re-Attempt Weekly Quiz Competition

Light Test - 15

Result

Light Test - 15

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Rank

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SHARING IS CARING

Question 1

$$5 cm$$

$$15 cm$$

$$20 cm$$

$$10 cm$$

Solution

Question 2

The size of image is same as size of object

Object distance and image distance is same

A plane mirror forms virtual and erect image

Image of the object in not laterally inverted

Solution

Question 3

Unpolished wood, covered with white cloth

Polished glass of red colour

Glass covered with cellophane paper

Smoked glass covered with green colour cloth.

Solution

Question 4

Bending of ray of light.

Bouncing back of ray of light.

Light travelling in a straight line.

None of these.

Solution

Question 5

Parallel

Convergent

Divergent

None of these

Solution

Question 6

$$8:35$$

$$9:35$$

$$7:35$$

$$8:25$$

Solution

Question 7

(i) is correct

(i) and (ii) are correct

(ii) and (iii) are correct

None of the above

Solution

Question 8

plane mirror

A concave mirror

A convex mirror

Concave-parabolic mirror.

Solution

Question 9

refraction

reflex action

reflection

regression

Solution

Question 10

Plane

Convex

Concave

Either convex or concave

Solution

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