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} $
Show Answer
Answer:
Correct Answer: A
Solution:
$ \beta \propto \frac{\lambda }{d} $ as $ d\to \frac{d}{3} $ so $ \beta \to 3\beta $
$ \therefore n=3 $
