Refraction Of Light Test

Result

Refraction Of Light Test - 3

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

A thin prism of angle A = 6° produces a deviation d = 3°. Find the refractive index of the material of prism

A
1.5

B
1.0

C
2.5

D
0.5

Solution
Question 2
1 / -0

A ray of light is incident at an angle of 60° on one face of a prism which has an angle of 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. Calculate the refractive index of the material of the prism

A
1

B
√2

C
√3

D
2

Solution
Question 3
1 / -0

Light of wavelength 6000Å enters from air into water (a medium of refractive index 4/3). Find the speed and wavelength [c = 3 × 10⁸ m/s]

A
2.25 × 10⁸ m/s, 4500Å

B
1.25 × 10⁸ m/s, 2500Å

C
3.15 × 10⁸ m/s, 3500Å

D
3.45 × 10⁸ m/s, 5500Å

Solution
Question 4
1 / -0

A ray of light is incident on a transparent glass-slab of refractive index 1.5. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence ?

A
30°

B

C

D

Solution
Question 5
1 / -0

An optical fibre consists of core of m1 surrounded by a cladding of m₂ < m₁ . A beam of light enters from air at an angle a with axis of fibre. The highest a for which ray can be travelled through fibre is

A

B

C

D

Solution
Question 6
1 / -0

A glass plate 4 mm thick is viewed from the above through a microscope. The microscope must be lowered 2.58 mm as the operator shifts from viewing the top surface to viewing the bottom surface through the glass. What is the index of refraction of the glass ?

A
1.61

B
1.55

C
3.24

D
1.21

Solution

From the information given, it is clear that the apparent depth is 2.58 mm and the real depth is 4mm. Therefore, the refractive index will be
Question 7
1 / -0

A vertical microscope is focussed on a point at the bottom of an empty tank. Water (m = 4/3) is then poured into the tank. The height of the water column is 4cm. Another lighter liquid, which does not mix with water and which has refractive index 3/2 is then poured over the water.The height of liquid column is 2cm. What is the vertical distance through which the microscope must be moved to bring the object in focus again ?

A
2.61 m

B
1.55 m

C
3.12 m

D
1.67 m

Solution

The apparent shift of the bottom point upwards will be
Question 8
1 / -0

Light from a sodium lamp (λ₀ = 589 nm) passes through a tank of glycerin (refractive index 1.47) 20m long in a time t₁ . If it takes a time t₂ to traverse the same tank when filled with carbon disulphide (index 1.63), then the difference t₂–t₁ is

A
6.67 × 10^-8 sec

B
1.09 × 10^-7 sec

C
2.07 × 10^-7sec

D
1.07 × 10^-8 sec

Solution
Question 9
1 / -0

A light beam is travelling from Region I to IV (Refer Figure). The refractive index in 4 Regions I, II, III and IV are , respectively. The angle of incidence θ for which the beam just misses entering Region IV is

A

B

C

D

Solution

The beam just misses entering region IV. It means it is striking at the interface at an angle of incidence = critical angle.

For the interface of region III and IV -
Question 10
1 / -0

The refractive index of the material of a prism is √2 and its prism angle is 30º. One of its refracting faces is polished. The incident beam of light will return back for the angle of incidence

A
60º

B
45º

C
30º

D
0º

Solution

The ray of light returns back from the polished face AC.