Ray Optics Test

Result

Ray Optics Test - 78

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Weekly Quiz Competition

Question 1
4 / -1

An achromatic prism is made by combining two prisms P₁ (μ_v =1.523, μ_r = 1.515) and P₂ (μ_v = 1.666, μ_r = 1.650) ; where μ represents the refractive index. If the angle of the prism P₁ is 10°, then the angle of the prism P₂ will be

A
5°

B
7.8°

C
10.6°

D
20°

Solution
Question 2
4 / -1

If the ratio of amounts of scattering of two light waves is 1:4, the ratio of their wavelength is

A
1 : 2

B

C

D
1 : 1

Solution
Question 3
4 / -1

The band spectra (characteristic of molecular species) is due to emission of radiation

A
Gaseous state

B
Liquid state

C
Solid state

D
All of three states
Question 4
4 / -1

Beams of red, green and violet light are falling on the refracting face of a prism, all at the same angle of incidence, if their angles of deviation are θ₁, θ₂ and θ₃respectively, then

A
θ₁ = θ₂ = θ₃

B
θ₁< θ₂< θ₃

C
θ₁> θ₂> θ₃

D
θ₂> θ₁> θ₃

Solution
Question 5
4 / -1

The spectrum of iodine gas under white light will be

A
Only violet

B
Bright lines

C
Only red lines

D
Some black bands in continuous spectrum
Question 6
4 / -1

A medium is said to be dispersive, if

A
Light of different wavelengths propagate at different speeds

B
Light of different wavelengths propagate at same speed but has different frequencies

C
Light is gradually bent rather than sharply refracted at an interface between the medium and air

D
Light is never totally internally reflected
Question 7
4 / -1

A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. The emergent ray is

A
Normal to the face through which it emerges

B
Inclined at 30° to the face through which it emerges

C
Inclined at 60° to the face through which it emerges

D
None of the above

Solution
Question 8
4 / -1

In a thin prism of glass (refractive index 1.5), which of the following relations between the angle of minimum deviations δ_m and angle of refraction r will be correct

A
δ_m = r

B
δ_m = 1.5 r

C
δ_m = 2r

D
δ_m = r/2

Solution
Question 9
4 / -1

The figures represent three cases of a ray passing through a prism of angle A. The case corresponding to minimum deviation is

A
1

B
2

C
3

D
None of these
Question 10
4 / -1

Dispersion can take place for

A
Transverse waves only but not for longitudinal waves

B
Longitudinal waves only but not for transverse waves

C
Both transverse and longitudinal waves

D
Neither transverse nor longitudinal waves