Wave Optics Test

Result

Wave Optics Test - 15

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Weekly Quiz Competition

Question 1
4 / -1

A light beam is incident at θ on an interface of air glass such that angle between reflected and refracted beam is 90⁰. Then θ is

A
tan^-1 (3/2)

B
tan^-12

C
tan^-1 (3/4)

D
tan^-1 (4/3).

Solution
Question 2
4 / -1

Out of the following statements which is not correct

A
when unpolarised light passes through a Nicol’s prism, the emergent light is elliptically polarised

B
Nicol’s prism works on the principle of double refraction and total internal reflection

C
Nicol’s prism can be used both, to produce and analyse polarised light

D
Calcite and Quartz are both, doubly refracting crystals.
Question 3
4 / -1

Polaroid glass is used in sun glasses because

A
it reduces the light intensity ot half on account of polarization

B
it is fashionable

C
it has good colour

D
it is chapter
Question 4
4 / -1

What changes on polarization of light ?

A
Frequency

B
Wavelength

C
Phase

D
Intensity
Question 5
4 / -1

When light is incident at polarizing angle, which is completely polarised ?

A
reflected light

B
refracted light

C
both

D
neither
Question 6
4 / -1

A beam of unpolarised light passes through a tourmaline crystal A and then through another such crystal B oriented so that its principal plane is parallel to A. The intensity of emergent light is I₀. Now B is rotated by 45^o about the ray.The emergent light will have intensity

A
I₀/2

B
I₀/√2

C
I₀√2

D
2I₀

Solution
Question 7
4 / -1

The time period of rotation of the sun is 25 day s and its radius is 7 × 10⁸ m. the Dopper shift for the light of wavelength 6000Å emitted from the surface of the sun will be

A
0.04 Å

B
0.4 Å

C
4.00 Å

D
40.0 Å

Solution
Question 8
4 / -1

The expression for apparent frequency of light when a source is moving towards earth is

A

B

C

D

Solution
Question 9
4 / -1

Which of the following is used in optical fibres?

A
total internal reflection

B
scattering

C
reflection

D
interference
Question 10
4 / -1

In Young’s double slit experiment, distance between tow sources is 0.1 mm. The distance of screen form the sources is 20 cm.Wavelength of light used is 5460 Å Then angular position of first dark fringe is A.

A
0.08^o

B
0.16^o

C
0.20^o

D
0.32^o

Solution