Ray Optics Test

Result

Ray Optics Test - 60

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Weekly Quiz Competition

Question 1
4 / -1

Absolute refractive indices of glass and water are 3/2 and 4/3 . The ratio of velocity of light in glass and water will be

A
4 : 3

B
8 : 7

C
8 : 9

D
3 : 4

Solution
Question 2
4 / -1

The ratio of thickness of plates of two transparent mediums A and B is 6 : 4. If light takes equal time in passing through them, then refractive index of B with respect to A will be

A
1.4

B
1.5

C
1.75

D
1.33

Solution
Question 3
4 / -1

Each quarter of a vessel of depth H is filled with liquids of the refractive indices n₁, n₂, n₃ and n₄ from the bottom respectively. The apparent depth of the vessel when looked normally is

A

B

C

D

Solution
Question 4
4 / -1

A ray of light passes through four transparent media with refractive indices μ₁, μ₂, μ₃ and μ₄ as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have

A
μ₁ = μ₂

B
μ₂ = μ₃

C
μ₃ = μ₄

D
μ₄ = μ₁

Solution
Question 5
4 / -1

An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive Index of water is 4/3 )

A
24 m

B
12 m

C
18 m

D
9 m

Solution
Question 6
4 / -1

The optical path of a monochromatic light is same if it goes through 4.0 cm of glass or 4.5 cm of water. If the refractive index of glass is 1.53, the refractive index of the water is

A
1.30

B
1.36

C
1.42

D
1.46

Solution
Question 7
4 / -1

Which of the following statement is true

A
Velocity of light is constant in all media

B
Velocity of light in vacuum is maximum

C
Velocity of light is same in all reference frames

D
Laws of nature have identical form in all reference frames
Question 8
4 / -1

A ray of light is incident on a transparent glass slab of refractive index 1.62. The reflected and the refracted rays are mutually perpendicular. The angle of incidence is

A
58.3°

B
50°

C
35°

D
30°

Solution
Question 9
4 / -1

A microscope is focused on a coin lying at the bottom of a beaker. The microscope is now raised up by 1 cm. To what depth should the water be poured into the beaker so that coin is 4 again in focus ? (Refractive index of water is 4/3)

A
1 cm

B
4/3 cm

C
3 cm

D
4 cm

Solution
Question 10
4 / -1

Velocity of light in glass whose refractive index with respect to air is 1.5 is 2 × 10⁸ m/s and in certain liquid the velocity of light found to be 2.5 × 10⁸ m/s. The refractive index of the liquid with respect to air is

A
0.64

B
0.80

C
1.20

D
1.44

Solution