First slide

Condition for Interference

Question

In Young’s double slit experiment, the wavelength of red light is $7 .8 \times 10^{- 5}$ cm and that of the blue light is $5 .2 \times 10^{- 5} cm$ . The value of n for which ${(n + 1)}^{th}$ blue bright band coincides with $n^{th}$ red band is

Easy

A

4
B

3
C

2
D

1

Solution

$\frac{(n + 1) λ_{b} D}{d} = \frac{{nλ}_{r} D}{d} \Rightarrow n = \frac{λ_{b}}{(λ_{r} - r_{b})} = \frac{5 .2 \times 10^{- 5}}{(7 .8 - 5 .2) \times 10^{- 5}} = 2$

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