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Interference of Light Waves and Young’s Experiment

A perfectly flat glass plate (=1.5) is placed over a perfectly

Question

Hard

Solving time: 5 mins

A perfectly flat glass plate $(μ = 1.5)$ is placed over a perfectly flat piece of plastic $(μ = 1.20)$ as shown. They touch each other at A. Light of wavelength $600 nm$ is incident normally from above and interference pattern of reflected light is observed (over the glass plate)

If space between glass and plastics is filled with air

A is location of minima

A is location of maxima

Total no. of dark fringes are

8

Total no. of dark fringes are

3

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Levi Discussed

A perfectly flat glass plate

(μ = 1.5)

is placed over a perfectly flat piece of plastic

(μ = 1.20)

as shown. They touch each other at A. Light of wavelength

600 nm

is incident normally from above and interference pattern of reflected light is observed (over the glass plate)

If space between glass and plastics is filled with air

10 mins ago

Discuss this question LIVE

10 mins ago

Text solutionVerified

2 t = nλ

[For air location of minima] as their is phase charge of

π

on reflection. Now, when replaced by water phase reversal will not happen since

μ_{\oplus} > μ_{plastics}

. Dark will be replaced by bright.

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Question Text	A perfectly flat glass plate $(μ = 1.5)$ is placed over a perfectly flat piece of plastic $(μ = 1.20)$ as shown. They touch each other at A. Light of wavelength $600 nm$ is incident normally from above and interference pattern of reflected light is observed (over the glass plate) If space between glass and plastics is filled with air
Topic	Wave Optics
Subject	Physics
Class	Class 12
Answer Type	Text solution:1
Upvotes	10

Text solutionVerified

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