Wave Optics Test

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Wave Optics Test - 5

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Question 1
1 / -0.25

Is light a particle or a wave?

A
Both particle and wave approaches help us understand different phenomenon

B
Light is schizophrenic i.e. sometimes it behaves like a particle and other times like a wave.

C
Light is a set of particles

D
Light is a set of waves

Solution

Explanation:explanation none
Question 2
1 / -0.25

Referring to the Young ’s double slit experiment, Phase difference corresponding to a Path Difference of λ /3 is

A
90^∘ DC

B
180^∘

C
60^∘

D
120^∘

Solution

We know that,
Phase difference=K ×path difference. K=2 π/ λ.
Therefore, phase difference=(2 π/ λ) ×( λ/3)=2 π/3=120 degree.
Question 3
1 / -0.25

The angle of incidence at which the reflected beam is fully polarized is called

A
Acute angle

B
Brewster angle

C
Malus angle

D
critical angle

Solution

Brewster 's angle is an angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection. When unpolarized light is incident at this angle, the light that is reflected from the surface is therefore perfectly polarized.
Question 4
1 / -0.25

The refractive index of glass is 1.5 which of the two colors red and violet travels slower in a glass prism?

A
red component of white light travels slower than the violet component

B
both red and violet travel slower at the same speed

C
both red and violet travel faster at the same speed

D
violet component of white light travels slower than the red component

Solution

(a) Speed of light in glass is c/μ=2 ×10⁸ m/s
(b) The speed of light in glass is not independent of the colour of light. The refractive index of a violet component of white light is greater than the refractive index of a red component. Hence, the speed of violet light is less than the speed of red light in glass. Hence, violet light travels slower than red light in a glass prism.
Question 5
1 / -0.25

In a young ’s double slit experiment, the central bright fringe can be identified by

A
as it is wider than other bright fringes

B
using white light instead of monochromatic light

C
as it is has greater intensity than other bright fringes

D
as it is narrower than other bright fringes

Solution

When we use white light, the central bright will have light from all wavelengths as none of them cancel out. Hence the central bright fringe appears white.
For other bright fringes, depending on the wavelength of light constructive interference will not take place for certain wavelengths. Hence they will not be white, rather will be coloured, hence differentiated from central fringe.
Question 6
1 / -0.25

The propagation of light is best described by,

A
particle model

B
dual / schizophrenic model

C
a wave model

D
None of the above

Solution

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. Unlike many other waves (sound, water waves, waves in a football stadium), light does not need a medium to “wave ”in.
Question 7
1 / -0.25

In general the term diffraction is used

A
if large number of sources is added vectorially

B
if two sources are added vectorially

C
if single source is multiplied by scalar

D
None of the above

Solution

The process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the waveforms produced.
Question 8
1 / -0.25

Shape of the wave front of light diverging from a point source is

A
conical

B
spherical

C
hyperboloid

D
plane

Solution

The shape of the wave front in case of a light diverging from a point source is spherical and is shown in the given figure. The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel grid.
Question 9
1 / -0.25

Emission and absorption is best described by,

A
Particle Model

B
Wave Model

C
Dual / Schizophrenic model

D
None of the above

Solution

The Particle Model of emission and absorption is based on the idea that light is composed of discrete particles called photons , and these photons carry quantized energy. This model helps us understand how atoms and molecules interact with light by either emitting or absorbing photons during electronic transitions.
Question 10
1 / -0.25

In a Young ’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment

A
660 nm

B
640 nm

C
620 nm

D
600 nm

Solution

Distance between the slits, d=0.28 ×10 −3 m
Distance between the slits and the screen, D=1.4m
Distance between the central fringe and the fourth (n=4) fringe,
u=1.2 ×10 −2 m
In case of a constructive interference, we have the relation for the distance between the two fringes as:
u=n λD/d
⇒λ=ud/nD=6 ×10 −7m=600nm

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Wave Optics Test - 5

Result

Wave Optics Test - 5

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SHARING IS CARING

Question 1

Both particle and wave approaches help us understand different phenomenon

Light is schizophrenic i.e. sometimes it behaves like a particle and other times like a wave.

Light is a set of particles

Light is a set of waves

Solution

Question 2

90∘ DC

180∘

60∘

120∘

Solution

Question 3

Acute angle

Brewster angle

Malus angle

critical angle

Solution

Question 4

red component of white light travels slower than the violet component

both red and violet travel slower at the same speed

both red and violet travel faster at the same speed

violet component of white light travels slower than the red component

Solution

Question 5

as it is wider than other bright fringes

using white light instead of monochromatic light

as it is has greater intensity than other bright fringes

as it is narrower than other bright fringes

Solution

Question 6

particle model

dual / schizophrenic model

a wave model

None of the above

Solution

Question 7

if large number of sources is added vectorially

if two sources are added vectorially

if single source is multiplied by scalar

None of the above

Solution

Question 8

conical

spherical

hyperboloid

plane

Solution

Question 9

Particle Model

Wave Model

Dual / Schizophrenic model

None of the above

Solution

Question 10

660 nm

640 nm

620 nm

600 nm

Solution

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90^∘ DC

180^∘

60^∘

120^∘