Question

Red light is generally used to observe diffraction pattern from single slit. If green light is used instead of red light then diffraction pattern :

• A. Will be more clear
• B. Will be contract
• C. Will be expanded
• D. Will not visualize

Answer 1

The correct option is B Will be contract

We know that

${\lambda }_{Blue}<{\lambda }_{Red}$.

The fringe pattern is given as:

$\beta =\frac{D\lambda }{d}$

Therefore fringe pattern will contract because fringe width $\propto \lambda$