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In Young's double slit experiment, how m...

In Young's double slit experiment, how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if `lambda=2000 Å` and `d= 7000 Å` ?

A

12

B

7

C

18

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
`d sin theta=nlambda`
`(7000) sin theta=n(2000)`
`sintheta=n/(7//2)le1`
`nle7//2`
`nle3.5`
`n=0, +-1, +-2, +-3`
Total number of maxima`=7`
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