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Question

A certain region of a soap bubble reflects red light of vacuum wavelength λ=650nm. What is the minimum thickness that this region of the soap bubble could have? Take the index of reflection of the soap film to be 1.41

A
1.2×107m
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B
650×109m
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C
120×107m
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D
650×105m
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Solution

The correct option is A 1.2×107m
By equation of destructive interference,
thickness, t=12(m+0.5)λ1.41
where m is any non-negative integer,
λ=650109.
For minimum thickness, take m=0
So, t=1.1521071.2107

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