Optics Question 209
Question: Red light is generally used to observe diffraction pattern from single slit. If blue light is used instead of red light, then diffraction pattern
[RPMT 2001; BCECE 2005; CPMT 2005]
Options:
A) Will be clearer
B) Will contract
C) Will expanded
D) Will not be visualized
Show Answer
Answer:
Correct Answer: B
Solution:
$ {\lambda _{\text{Blue}}}<{\lambda _{\text{Red}}} $ .
Therefore fringe pattern will contract because fringe width $ \propto \lambda $
