First slide

Coherent sources and their importance in interference

Question

In Young's double slit experiment, 62 fringes are seen in visible region for sodium light of wavelength 5893 Å. If violet light of wavelength 4358 Å is used in place of sodium light, then number of fringes seen will be

Easy

A

54
B

64
C

74
D

84

Solution

$n_{1} λ_{1} = n_{2} λ_{2} \Rightarrow 62 \times 5893 = n_{2} \times 4358 \Rightarrow n_{2} = 84$

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