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Asked Dec 17, 2019
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Figure CQ24.7 shows rays with wavelength l incident from above onto thin films surrounded by air. (a) Will the film in Figure CQ24.7a appear bright due to constructive interference or dark due to destructive interference? Indicate your answer with B for bright or D for dark. (b) Repeat part (a) for Figure CQ24.7b. (c) Repeat part (a) for Figure CQ24.7c.

Air
Air
Air
1.50A
1.25A
1.00A
n= 1.50
n= 1.50
n= 1.50
Air
Air
Air
Figure CQ24.7
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Air Air Air 1.50A 1.25A 1.00A n= 1.50 n= 1.50 n= 1.50 Air Air Air Figure CQ24.7

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Expert Answer

Step 1

Given:

Wavelength of light = λ

Incident on a medium having refractive index = 1.5

Step 2

Constructive interference occurs when maxima of two sinusoidal wave meets. Formation of constructive interference displays as bright fringe.

The path difference in constructive interference is,

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2d sin 0 = nå

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Step 3

Destructive interference occurs when minima of two sinusoidal wave meets. Formation of destructive in...

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)- 2d sin e = (2n+1

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