First slide

Coherent sources and their importance in interference

Question

In double slit experiment, the angular width of the fringes is 0.20^o for the sodium light ( $λ$ = 5890 Å). In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is

Easy

A

$Increase of 589 Å$
B

$Decrease of 589 Å$
C

$Increase of 6479 Å$
D

Zero

Solution

$θ = \frac{λ}{d}; θ can be increased by increasing λ, so here λ has to be increased by 10%$
$i.e., Increase in λ = \frac{10}{100} \times 5890 = 589 \overset{0}{A}$

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