First slide

Coherent sources and their importance in interference

Question

The colour of bright fringe nearest to central achromatic fringe in the interference pattern with white light will be

Easy

A

violet
B

red
C

green
D

yellow

Solution

$A s y = \frac{λ . D}{d} ∴ y \propto λ A s λ f o r v i o l e t i s l e a s t, t h e r e f o r e, f r i n g e n e a r e s t t o c e n t r a l a c h r o m a t i c f r i n g e w i l l b e v i o l e t .$

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