Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

A concave mirror of focal length 'f' produces an image 'n' times farther than the object. If the image is real, then the distance of the object from the mirror is:

A
(n+1)f/ n

B
(n-1)f

C
(n+1) f

D
(n-1)f / n

Solution

We know, 1/f = 1/u + 1/v

OR, 1/u = 1/f - 1/v = 1/f - 1/ nu

or, 1/u + 1/ nu = 1/f

or. 1/u (1 + 1/n) = 1/f

or, u = (n+1)f / n
Question 2
1 / -0

In a lateral inversion

A
The left side of the object becomes the right side of the image and vice-versa.

B
The right side of the object remains the right side of the image.

C
The left side of the object remains the left side of the image.

D
None of the above

Solution

In a lateral inversion, the left side of the object becomes the right side of the image formed by the plane mirror and vice-versa.
Question 3
1 / -0

Which of the following English letter shows lateral inversion?

A
H

B
O

C
L

D
I

Solution

The letter ‘L’ shows lateral inversion. Rest all appear same after reflection.
Question 4
1 / -0

When the image is of the same size as the object, the magnification is

A
Equal to one

B
Smaller than one

C
Zero

D
Greater than one

Solution

Magnification is the ratio of the height of the image to the height of the object. If the image size is same as object size then the magnification is equal to one.
Question 5
1 / -0

The objective lens of microscope use

A
Convex mirror

B
Convex lens

C
Concave lens

D
Concave mirror

Solution

Convex lens is a converging lens, that is, the light rays converge at a point when they pass through it. Due to this they are used in the applications where a sharp focus on the object is required, and hence they are used as the objective lens of the microscope.
Question 6
1 / -0

A lens with ________ is never possible.

A
two optical centres

B
two centre of curvature

C
two principal focus

D
two radius of curvature

Solution

A lens with two optical centres is never possible.
Question 7
1 / -0

The maximum image distance in case of a concave lens of focal length 'f' is:

A
4f

B
f

C
3f

D
2f

Solution

The maximum image distance in case of a concave lens is limited within its focal length.
Question 8
1 / -0

An inverted image can be seen by using a convex mirror under what circumstances?

A
Under no circumstances

B
When the object is placed at infinity

C
When the object is at a distance equal to the radius of curvature of the mirror

D
When the distance of the object from the mirror is equal to the focal length of the mirror.

Solution

The image formed by a convex mirror is always virtual and erect irrespective of the position of the object.

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Re-Attempt Weekly Quiz Competition

Light Reflection and Refraction Test - 3

Result

Light Reflection and Refraction Test - 3

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Question 1

(n+1)f/ n

(n-1)f

(n+1) f

(n-1)f / n

Solution

Question 2

The left side of the object becomes the right side of the image and vice-versa.

The right side of the object remains the right side of the image.

The left side of the object remains the left side of the image.

None of the above

Solution

Question 3

H

O

L

I

Solution

Question 4

Equal to one

Smaller than one

Zero

Greater than one

Solution

Question 5

Convex mirror

Convex lens

Concave lens

Concave mirror

Solution

Question 6

two optical centres

two centre of curvature

two principal focus

two radius of curvature

Solution

Question 7

4f

f

3f

2f

Solution

Question 8

Under no circumstances

When the object is placed at infinity

When the object is at a distance equal to the radius of curvature of the mirror

When the distance of the object from the mirror is equal to the focal length of the mirror.

Solution

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