Optics Question 1090

Question: If yellow light in the Young’s double slit experiment is replaced by red light, the fringe width will

[MP PMT 1996]

Options:

A) Decrease

B) Remain unaffected

C) Increase

D) First increase and then decrease

Show Answer

Answer:

Correct Answer: C

Solution:

Fringe width $ (\beta )=\frac{D\lambda }{d}\Rightarrow \beta \propto \lambda $ As $ {\lambda _{red}}>{\lambda _{yellow}}, $ hence fringe width will increase.



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