Wave Optics Test

Result

Wave Optics Test - 56

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Weekly Quiz Competition

Question 1
4 / -1

If I₀ is the intensity of the principle maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled

A

B

C

D
Question 2
4 / -1

In a Young\'s double slit experiment, the separation between the two slits is d and the wavelength of the light is λ The intensity of light falling on slit 1 is four times the intensity of light falling on slit 2. Choose the correct choice (s)

A
If d= λ, the screen will contain only maximum

B
If λ < d< 2 λ., at the least one more maximum (besides the central maximum) will be observed in the screen

C
If the intensity fo light falling on slit 1 is reduced so that it becomes equal to that of slit 2, the intensities of the observed dark and bright fringes will increase

D
If the intensity of light falling on slit 2 is increased so that it becomes equal to that of slit 1, the intensities of the observed dark and bright fringes will increase

Solution
Question 3
4 / -1

In an interference arrangement similar to Young\'s double slit experiment, the slits S₁ and S₂ are illuminated with coherent microwave sources each of frequency 10⁶ Hz. The sources are synchronized to have zero phase difference. The slits are separated by distance d= 150 m. The intensity I(θ) is measured as a function of θ, where θ is defined as shown. If I₀ is maximum intensity, then I (θ) for 0 ≤ θ ≤ 90° is given by

A
I(θ) = I₀ for θ = 0˚

B
I(θ) = I₀/2 for θ = 30˚

C
I(θ) = I₀/4 for θ = 90˚

D
I(θ) is constant for all values of θ

Solution
Question 4
4 / -1

In Young\'s double slit experiment, white light is used. The separation between the slits is b. The screen is at a distance d (d >> b) from the slits. Some wavelengths are missing exactly in front of one slit. These wavelengths are

A

B

C

D

Solution
Question 5
4 / -1

In the Young\'s double slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that

A
The intensities of individual sources are 5 and 4 units respectively

B
The intensities of individual sources are 4 and 1 units respectively

C
The ratio of their amplitudes is 3

D
The ratio of their amplitudes is 2

Solution
Question 6
4 / -1

In Young\'s double slit experiment with a source of light of wavelength 6320 Å, the first maxima will occur when

A
Path difference is 9480 Å

B
Phase difference is 2π radian

C
Path difference is 6320 Å

D
Phase difference is π radian

Solution
Question 7
4 / -1

A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film given an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film.
Statement 1 When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of it
Statement 2 The centre of the interference pattern is dark.

A
Statement 1 is true, statement 2 is true ; statement 2 is a correct explanation for statement 1

B
Statement 1 is true, statement 2 is true; statement 2 is not a correct explanation for statement is 1

C
Statement 1 is true, statement 2 is false

D
Statement 1 is false, statement 2 is true
Question 8
4 / -1

An initially parallel cylindrical beam travels in a medium of refractive index µ(I) = µ₀ + µ₂I, where µ₀ and µ₂ are positive constant and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.
The initial shape of the wavefront of the beam is

A
Planar

B
Convex

C
Concave

D
Convex near the axis and concave near the periphery

Solution
Question 9
4 / -1

An initially parallel cylindrical beam travels in a medium of refractive index µ(I) = µ₀ + µ₂I, where µ₀ and µ₂ are positive constant and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.
The speed of light in the medium is

A
Maximum on the axis of the beam

B
Minimum on the axis of the beam

C
The same everywhere in the beam

D
Directly proportional to the intensity

Solution
Question 10
4 / -1

An initially parallel cylindrical beam travels in a medium of refractive index µ(I) = µ₀ + µ₂I, where µ₀ and µ₂ are positive constant and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.
As the beam enters the medium, it will

A
Travel as a cylindrical beam

B
Diverge

C
Converge

D
Diverge near the axis and coverage near the periphery

Solution