First slide

Coherent sources and their importance in interference

Question

In Young’s double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å, coming from the coherent sources S₁and S₂. At certain point P on the screen third dark fringe is formed. Then the path difference S₁P – S₂P in microns is

Easy

A

0.75
B

1.5
C

3.0
D

4.5

Solution

For dark fringe at P
$S_{1} P - S_{2} P = Δ = (2 n - 1) λ / 2 Here n = 3 and λ = 6000 \overset{0}{A} So, Δ = \frac{5 λ}{2} = 5 \times \frac{6000}{2} = 15000 \overset{0}{A} = 1 .5 micron$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App