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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
For maximum intensity on the screen,
`dsintheta= nlambda`
`implies sintheta= (nlambda)/(d)= (n(2000))/(7000) implies sintheta= (n)/(3.5)` as `(sintheta)_("max")= 1`
So, n=0,1,2,3 only
Only seven maximas can be obtained.
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