First slide

Coherent sources and their importance in interference

Question

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 $λ = 2000 \overset{o}{A}$ and $d = 7000 \overset{o}{A}$

Moderate

A

12
B

7
C

18
D

4

Solution

For maximum intensity on the screen
$dsinθ = nλ \Rightarrow sinθ = \frac{nλ}{d} = \frac{n (2000)}{7000} = \frac{n}{3.5}$
Since maximum value of $sinθ$ is 1
So n=0,1,2,3 only. Thus only seven maximas can be obtained on both sides of the screen.

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