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Questions  

Plane wave fronts are shown in two mediums. Find the refractive index of the second medium

a
2
b
4
c
6
d
1

detailed solution

Correct option is A

Spacing between two consecutive wavefronts represents wavelength of a wave.Hence,  λ1 = 2m    and    λ2 = 1m   Also, refractive index , μ=cfλ  In refraction speed of light c and frequency f doesn't change. ∴  μ ∝ λ  ⇒μ2μ1 = λ1λ2 ⇒μ21=21 ⇒μ2 = 2

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