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Question

Calculate the smallest thickness of the soap bubble which produces a constructive interference for a red light of the wavelength 650 nm.

Take refractive index to be 1.33.

A
122.2 nm
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B
102.2 nm
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C
112.2 nm
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D
132.2 nm
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Solution

The correct option is A 122.2 nm
For the constructive interference in soap film,

2μt=(n1/2)λ

For minimum thickness, n=1

2μt=λ/2

t=λ4μ=6504×1.33=122.2 nm

Hence, option (A) is the correct answer.

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