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 $



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