Optics Question 1079
Question: In Young’s double slit experiment, if L is the distance between the slits and the screen upon which interference pattern is observed, x is the average distance between the adjacent fringes and d being the slit separation. The wavelength of light is given by
[MP PET 1993]
Options:
A) $ \frac{xd}{L} $
B) $ \frac{xL}{d} $
C) $ \frac{Ld}{x} $
D) $ \frac{1}{Ldx} $
Show Answer
Answer:
Correct Answer: A
Solution:
We know that fringe width $ \beta =\frac{D\lambda }{d} $
$ \therefore x=\frac{L\lambda }{d}\Rightarrow \lambda =\frac{xd}{L} $
