Wave Optics Test

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Wave Optics Test - 21

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Question 1
1 / -0

A white light is passed through the two narrow slits and produced a pattern of alternating bright and dark lines on the screen as shown above. Which of the following phenomenon is responsible for the bright and dark lines on the screen?

A
$$refraction$$

B
$$reflection$$

C
$$polarization$$

D
$$frequency$$

E
$$interference$$

Solution

Due to path difference of light coming from the two slits at different points in the screen, an interference pattern is formed.
The light from the sources added up in accordance with their phases to give consecutive bright and dark fringes.
Question 2
1 / -0

Making a light wave vibrate in only one plane is known as :

A
refraction.

B
reflection

C
Interference

D
diffraction

E
polarization.

Solution

Light in the form of a plane wave in space is said to be linearly polarized. Light is a transverse electromagnetic wave, but natural light is generally unpolarized, all planes of propagation being equally probable.
The process of making the light wave vibrated in a single plane is known as polarization.
Question 3
1 / -0

A white light is passed through the two narrow slits and produced a pattern of alternating bright and dark lines on the screen as shown above. What will effects on the central bright band , if the distance between screen and slits are increased?

A
become wider

B
become narrower

C
remain unchanged

D
disappear completely

E
rotate $$90^{\circ}$$

Solution

The setup shown is that of Young's Double Slit Experiment.
The fringe width in the experiment is given as $$\beta=\dfrac{D\lambda}{d}$$
where $$d$$ is the distance between the slits, $$D$$ is the distance between screen and slits.
Hence the central fringe also widens when distance between screen and slits increases.
Question 4
1 / -0

If light is passed through a double-slit opening and falls onto a screen, Identify the pattern produced on the screen .

A
a bright central band of light with slightly diminished, alternating bright and dark bands.

B
a bright central band of light with tiny lines toward the edges of the screen.

C
a large circle of light with tiny circles around it

D
equally sized concentric circles of light.

E
one antinode and no nodes.

Solution

When light is passed through a double slit opening, light from the two slits interfere at different points in the screen, forming alternating bright and dark fringes due to constructive and destructive interference respectively. However the intensities of higher order bands is slightly diminished.
Such an arrangement was first studied by Young, and has been since called Young's Double Slit Setup.
Question 5
1 / -0

Identify which of the following should be used for polarised light waves?
I. Sunglasses
II. Remove ultraviolet light
III. Reveal stress patterns

A
I only

B
II only

C
I and III only

D
II and III only

E
I, II, and III

Solution

Polarizers are used in industry to reveal stress patterns in machinery and tools. Sunglasses are used to protect the eyes by polarizing the light to reduce glare using the tailor-made material of the glasses.
Question 6
1 / -0

Two light beams superimposed each other constructively this results in:

A
a loss of kinetic energy

B
the destruction of the waves

C
the reversal of the direction of the waves

D
a larger wave

Solution

For constructive interference, $$A_R = A_1 + A_2$$
Due to the constructive interference of the superimposing waves, resultant wave of larger amplitude is obtained and hence constructive interference results in the larger wave.
Question 7
1 / -0

Light waves exhibit polarization but sound waves do not exhibit polarization because they are not:

A
longitudinal

B
coherent

C
dispersive

D
transverse

E
refractive

Solution

Only transverse waves can exhibit polarization.
Light waves are transverse waves whereas sound waves are longitudinal waves, hence sound waves can not be polarized.
Question 8
1 / -0

Constructive and destructive interference occur in:

A
cosmic rays

B
light raus

C
sound waves

D
water waves

E
All of these

Solution

Interference (constructive and destructive) is one of the basic properties of a wave, therefore it will occur in all the given waves, no matter they are electromagnetic or mechanical, transverse or longitudinal.
Question 9
1 / -0

A person shines a coherent light of a bulb through an object, $$A$$, which produces a pattern of concentric rings on a screen, $$B$$. $$A$$ is most likely

A
a polarization filter

B
a single-slit

C
a multiple-slit diffraction grating

D
a prism

E
a sheet with a pinhole

Solution

A polarization filter will limit the light vectors in a single plane i.e. polarization.
A prism will split the light i.e. dispersion .
A slit system will make a diffraction pattern on screen $$B$$ , but in this pattern , fringes are straight.
Due to its circular size , a pinhole will produce diffraction pattern on screen $$B$$ in the forms of concentric rings.
Question 10
1 / -0

Three waves are given below.
I. Sound waves
II. Visible light waves
III. X-rays

Which of the above waves cannot be polarised?

A
I only

B
III only

C
I and II only

D
I and III only

E
I, II and III

Solution

Only the transverse waves can be polarized.
As the sound waves are longitudinal waves in nature whereas visible light rays and X-rays are transverse waves.
Thus sound waves cannot be polarized.

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Wave Optics Test - 21

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Wave Optics Test - 21

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SHARING IS CARING

Question 1

$$refraction$$

$$reflection$$

$$polarization$$

$$frequency$$

$$interference$$

Solution

Question 2

refraction.

reflection

Interference

diffraction

polarization.

Solution

Question 3

become wider

become narrower

remain unchanged

disappear completely

rotate $$90^{\circ}$$

Solution

Question 4

a bright central band of light with slightly diminished, alternating bright and dark bands.

a bright central band of light with tiny lines toward the edges of the screen.

a large circle of light with tiny circles around it

equally sized concentric circles of light.

one antinode and no nodes.

Solution

Question 5

I only

II only

I and III only

II and III only

I, II, and III

Solution

Question 6

a loss of kinetic energy

the destruction of the waves

the reversal of the direction of the waves

a larger wave

Solution

Question 7

longitudinal

coherent

dispersive

transverse

refractive

Solution

Question 8

cosmic rays

light raus

sound waves

water waves

All of these

Solution

Question 9

a polarization filter

a single-slit

a multiple-slit diffraction grating

a prism

a sheet with a pinhole

Solution

Question 10

I only

III only

I and II only

I and III only

I, II and III

Solution

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