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YDSE Problems II

In Young's do...

Question

In Young's double slit experiment, a third slit is made in between the double slits. Then

A

Fringes of unequal width are formed

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B

Contrast between bright and dark fringes is reduced

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C

Intensity of fringes totally disappears

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D

Only bright light is observed on the screen

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Solution

The correct option is B Contrast between bright and dark fringes is reduced
In Young's double slit experiment when light is passing through slit contrast is being reduces Because light will through three slit than light will partially able to pass through slit therefore contrast will be reduced.

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