Optics Question 1142
Question: In a Young’s double-slit experiment the fringe width is 0.2 mm. If the wavelength of light used is increased by 10% and the separation between the slits is also increased by 10%, the fringe width will be
[MP PMT 2004]
Options:
A) 0.20 mm
B) 0.401 mm
C) 0.242 mm
D) 0.165 mm
Show Answer
Answer:
Correct Answer: A
Solution:
$ \beta =\frac{\lambda D}{d} $ ; If $ \lambda $ and d both increase by 10%, there will be no change in fringe width $ (\beta ) $ .
