Wave Optics Test

Result

Wave Optics Test - 24

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Weekly Quiz Competition

Question 1
4 / -1

In Young’s double slit experiment, the wavelength of light was changed from 7000 Å to 3500 Å. While doubling the separation between the slits,which of the following is not true for this expt.?

A
The width of fringes changes

B
The colour of bright fringes changes

C
The separation between successive bright fringes changes

D
The separation between successive dark fringes remains unchanged

Solution
Question 2
4 / -1

To demonstrate the phenomenon of interference, we require two sources, which emit radiations

A
of nearly same frequency

B
of the same frequency

C
of different wavelengths

D
of the same frequency and having a definite phase relationship.
Question 3
4 / -1

Interference fringes are produced in Young’s double slit experiment using light of wavelength 5000 Å .when a film of material 2.5 × 10^-3 m thick was placed over one of the slits, the fringe pattern shifted by a distance equal to 20 fringe widths. The refractive index of the material of the film is

A
1.25

B
1.33

C
1.4

D
1.5

Solution
Question 4
4 / -1

If two coherent sources are placed at a distance 3 λ from each other, symmetric to the centre of the circle shown in fig (R>>λ), then number of bright fringes shown on the screen placed along the circumference is

A
16

B
12

C
8

D
4

Solution
Question 5
4 / -1

White light is used to illuminate the two slits in a young’s double slit expt. The separation between slits is b and the screen is at a distance d (>>b) from the slits. At a point on the screen directly in front of one of the slits, certain wavelengths are missing, fig. Some of these missing wavelengths are

A
λ/b²/d

B
λ2b²/d

C
λ = b²/3d

D
λ = 2b²/3d

Solution
Question 6
4 / -1

The two coherent sources with intensity ratio β produce interference. The fringe visibility will be

A

B

C

D

Solution
Question 7
4 / -1

In a biprism expt, 5th dark fringe is obtained at a point. If a thin transparent film is placed in the path of one of waves, then 7th bright fringe is obtained at the same point. The thickness of the film in terms of wavelength λ and refractive index μ will be

A

B

C

D

Solution
Question 8
4 / -1

A monochromatic beam of light falls on young’s double slit expt. Apparatus at some (say θ) as shown in fig . A thin sheet of glass is inserted infront of the lower slit S₂. The central bright fringe (path difference= 0) will be obtained

A
any where depending on angle θ thickness of plate t and refractive index of glass μ

B
at O

C
below O

D
above O
Question 9
4 / -1

Light of wavelength λ is incident on a slit of width d. The resulting diffraction pattern is observed on a screen at a distance D. The linear width of the principal maximum is equal to the width of the slit, if D equals

A

B

C

D

Solution
Question 10
4 / -1

A plate of thickness t made of a material of refractive index μ is placed in front of one of the slits in a double slit experiment. What should be the minimum thickness t, which will make the intensity at the centre of the fringe pattern zero?

A

B

C

D

Solution