Optics Question 1139

Question: If the separation between slits in Young’s double slit experiment is reduced to $ \frac{1}{3}rd, $ the fringe width becomes n times. The value of n is

[MP PET 2003]

Options:

A) 3

B) $ \frac{1}{3} $

C) 9

D) $ \frac{1}{9} $

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Answer:

Correct Answer: A

Solution:

$ \beta \propto \frac{\lambda }{d} $ as $ d\to \frac{d}{3} $ so $ \beta \to 3\beta $

$ \therefore n=3 $



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