Wave Optics Test

Result

Wave Optics Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

In Young's double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes:

A
1/9 times

B
1/3 times

C
3 times

D
9 times

Solution

β ∝ 1/d
If d becomes thrice, then β becomes 1/3 times.
Question 2
1 / -0

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

A
as it is narrower than other bright fringes

B
by using both white light and monochromatic light

C
by using white light instead of monochromatic light

D
as it is wider than other bright fringes

Solution

In a young’s double-slit experiment the central bright fringe is identified by using white light instead of monochromatic light.
Question 3
1 / -0

How is interference pattern in double slit experiment affected, if a source of blue light is used in place of yellow light producing the same intensity?

A
The fringe width will become fainter

B
The fringe width will decrease

C
The fringe width will become brighter

D
The fringe width will increase

Solution

The fringe width is given by
β = Dλ/d
Therefore, when blue light (light of lesser wavelength) is used, the fringe width will decrease.