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Monochromatic light passes through two parallel narrow slits and forms an interference pattern on a screen. As the distance between the two slits is decreased, the distance between light bands in the pattern on the screen will


a.decrease.


b.increase.


c.remain the same.

Verified Answer :

Hagrid

Monochromatic
light passes through two parallel narrow slits and forms an interference
pattern on a screen. As the distance between the two slits is decreased,
the distance between light bands in the pattern on the screen will decrease.
The answer is letter A.

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Answer:

b.increase.

Explanation:

The distance between the light bands and the distance between the two slits, are related as follows:

\(y=\frac{m\lambda D}{d}\)

Here, y is the distance between light bands in the pattern, m is the number of light bands observed in the pattern, \(\lambda\) is the light's wavelenght, D is the distance between the two slits and the screen where the pattern is observed and d is the distance between the two slits. Thus, as the distance between the two slits is decreased, the distance between light bands will increase.

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