First slide

Young's double slit Experiment

Question

In YDSE, how many maxima can be obtained on the screen if wave length of radiation used is 200 nm and d = 700 nm

Easy

A

9
B

7
C

8
D

6

Solution

The condition for maxima $d sinθ = nλ$
for maximum path difference $d = nλ$
$n = \frac{d}{λ} = \frac{700}{200} = 3.5$
Hence 3rd order maximum is possible on both sides of central maximum.
Total 7 maximum can be observed.

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