Ray Optics Test

Result

Ray Optics Test - 57

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Weekly Quiz Competition

Question 1
4 / -1

Immiscible transparent liquids A, B, C, D and E are placed in a rectangular container of glass with the liquids making layers according to their densities. The refractive index of the liquids are shown in the adjoining diagram. The container is illuminated from the side and a small piece of glass having refractive index 1.61 is gently dropped into the liquid layer. The glass piece as it descends downwards will not be visible in

A
Liquid A and B only

B
Liquid C only

C
Liquid D and E only

D
Liquid A, B, D and E
Question 2
4 / -1

If _iμ_j represents refractive index when a light ray goes from medium i to medium j , then the product ₂μ₁ × ₃μ₂ × ₄μ₃ is equal to

A
₃μ₁

B
₃μ₂

C

D
₄μ₂

Solution
Question 3
4 / -1

The wavelength of light diminishes μ times (μ = 1.33 for water) in a medium. A diver from inside water looks at an object whose natural colour is green. He sees the object as

A
Green

B
Blue

C
Yellow

D
Red
Question 4
4 / -1

Light travels with a speed of 2 × 10⁸ m/s in crown glass of refractive index 1.5. What is the speed of light in dense flint glass of refractive index 1.8

A
1.33 × 10⁸ m/s

B
1.67 × 10⁸ m/

C
2.0 × 10⁸ m/s

D
3.0 × 10⁸ m/s

Solution
Question 5
4 / -1

A fish in water (refractive index n) looks at a bird vertically above in the air. If y is the height of the bird and x is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is

A

B

C

D

Solution
Question 6
4 / -1

For a colour of light the wavelength.for air is 6000 Å and in water the wavelength is 4500 Å. Then the speed of light in water will be

A
5.0 × 10¹⁴ m/s

B
2.25 × 10⁸ m/s

C
4.0 × 10⁸ m/s

D
Zero

Solution
Question 7
4 / -1

A ray of light travelling inside a rectangular glass block of refractive index √2 is incident on the glass-air surface at an angle of incidence of 45°. The refractive index of air is 1. Under these conditions the ray

A
Will emerge into the air without any deviation

B
Will be reflected back into the glass

C
Will be absorbed

D
Will emerge into the air with an angle of refraction equal to 90°

Solution
Question 8
4 / -1

If ε₀ and µ₀ are respectively, the electric permittivity and the magnetic permeability of free space, εand μ the corresponding quantities in a medium, the refractive index of the medium is

A

B

C

D

Solution
Question 9
4 / -1

A beam of monochromatic blue light of wavelength 4200 Å in air travels in water (μ = 4/3). Its wavelength in water will be

A
2800 Å

B
5600 Å

C
3150 Å

D
4000 Å

Solution
Question 10
4 / -1

If μ₀ be the relative permeability and K₀ the dielectric constant of a medium, its refractive index is given by

A

B

C

D

Solution