Optics Question 898

Question: A light wave of wavelength λ0 propagates from point A to point B. We introduce in its path a glass plate of refractive index n and thickness l. The introduction of the plate alters the phase of the plate at B by an angle ϕ . If λ is the wavelength of lights on emerging from the plate, then

Options:

A) Δϕ=0

B) Δϕ=2πlλ0

C) Δϕ=2πln2(1λ1λ0)

D) Δϕ=2πlλ0(n1)

Show Answer

Answer:

Correct Answer: D

Solution:

[d] ϕi=2πλ0

ϕf=2πλ

Δϕ=2π(1λ1λ0)

Further, by Snell’s law nλ=(1)λ0λ=λ0nΔϕ=2πlλ0(n1)



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