Ray Optics Test

Result

Ray Optics Test - 61

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Weekly Quiz Competition

Question 1
4 / -1

A thin oil layer floats on water. A ray of light making an angle of incidence of 40° shines on oil layer. The angle of refraction of light ray in water is
( μ_oil = 1.45, μ_water = 1.33

A
36.1°

B
44.5°

C
26.8°

D
28.9°

Solution
Question 2
4 / -1

Velocity of light in a medium is 1.5 × 10⁸ m/s. Its refractive index will be

A
8

B
6

C
4

D
2

Solution
Question 3
4 / -1

The wavelength of sodium light in air is 5890 Å. The velocity of light in air is 3 × 10⁸ ms^–1. The wavelength of light in a glass of refractive index 1.6 would be close to

A
5890 Å

B
3681 Å

C
9424 Å

D
15078 Å

Solution
Question 4
4 / -1

The mean distance of sun from the earth is 1.5 × 10⁸ km (nearly). The time taken by the light to reach earth from the sun is

A
0.12 min

B
8.33 min

C
12.5 mm

D
6.25 min

Solution
Question 5
4 / -1

Refractive index of air is 1.0003. The correct thickness of air column which will have one more wavelength of yellow light (6000 Å) than in the same thickness in vacuum is

A
2 mm

B
2 cm

C
2 m

D
2 km

Solution
Question 6
4 / -1

An astronaut in a spaceship see the outer space as

A
White

B
Black

C
Blue

D
Red
Question 7
4 / -1

Speed of light is maximum in

A
Water

B
Air

C
Glass

D
Diamond

Solution
Question 8
4 / -1

If the wavelength of light in vacuum be λ, the wavelength in a medium of refractive index n will be

A

B

C

D

Solution
Question 9
4 / -1

A
30°

B
45°

C
60°

D
75°

Solution
Question 10
4 / -1

A ray of light strikes a transparent rectangular slab (of refractive index √2 ) at an angle of incidence of 45°. The angle between the reflected and refracted rays is

A
75°

B
90°

C
105°

D
120°

Solution