First slide

Young's double slit Experiment

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

Moderate

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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