Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following has the highest refractive index?

A
Glass

B
Water

C
Iron

D
Diamond

Solution

Diamond has a very high refractive index. Diamonds are cut so that a light ray falling on the diamond is reflected multiple times inside the diamond and therefore sends light out in all directions.
Question 2
1 / -0

Which of the following is a true statement?

A
The power of a lens is always positive

B
The power of a lens is always negative

C
The power of a convex lens is positive

D
The power of a concave lens is positive
Question 3
1 / -0

For the spherical mirror, what is the relation between radius of curvature (R) and focal length (f)?

A
R = 4f

B
R = f

C
R = 2f

D
R = 3f

Solution

Thus, for a spherical mirror {both concave and convex}, the focal length is half of its radius of curvature.

f = R/2

R = 2f
Question 4
1 / -0

The speed of light in vacuum is ____ m/s.

A
3 × 10⁵

B
3 × 10⁶

C
3 × 10⁷

D
3 × 10⁸

Solution

Speed of light in vacuum is exact 299,792,458 metres per second or 3 × 10⁸ m/sec
Question 5
1 / -0

The centre of the reflecting surface of a spherical mirror is called its ………

A
Pole

B
Focus

C
Aperture

D
Centre of curvature

Solution

The center of the reflecting surface of a spherical mirror is called as the pole of the mirror.
Question 6
1 / -0

The Image formed by plane mirror is

A
Real and erect

B
Real and inverted

C
Virtual and erect

D
Virtual and inverted

Solution

Plane mirrors always produce virtual images, because they never focus light into a single converging point. Plane mirrors use perfect regular reflection, which creates an upright, virtual image. The mirror also keeps everything in correct proportional sizes.
Question 7
1 / -0

The unit of power of lens is

A
Meter

B
Centimeter

C
Dioptre

D
Hertz

Solution

The unit of power of lens is Dioptre it’s denoted by D. The power of a lens is defined as the reciprocal of its focal length in meters.

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Re-Attempt Weekly Quiz Competition

Light Reflection and Refraction Test - 21

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Light Reflection and Refraction Test - 21

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SHARING IS CARING

Question 1

Glass

Water

Iron

Diamond

Solution

Question 2

The power of a lens is always positive

The power of a lens is always negative

The power of a convex lens is positive

The power of a concave lens is positive

Question 3

R = 4f

R = f

R = 2f

R = 3f

Solution

Question 4

3 × 105

3 × 106

3 × 107

3 × 108

Solution

Question 5

Pole

Focus

Aperture

Centre of curvature

Solution

Question 6

Real and erect

Real and inverted

Virtual and erect

Virtual and inverted

Solution

Question 7

Meter

Centimeter

Dioptre

Hertz

Solution

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3 × 10⁵

3 × 10⁶

3 × 10⁷

3 × 10⁸