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## Find the minimum thickness (in nm) of a soap bubble that appears red when illuminated by white light perpendicular to its surface. Take the

Question

Find the minimum thickness (in nm) of a soap bubble that appears red when illuminated by white light perpendicular to its surface. Take the wavelength to be 680 nm, and assume the same index of refraction as water.

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Physics
6 months
2021-07-21T12:32:52+00:00
2021-07-21T12:32:52+00:00 1 Answers
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## Answers ( )

Answer:The thickness of the soap bubble is 170 nm.

Explanation:Given that,

Wavelength of light,

We need to find the minimum thickness of a soap bubble that appears red when illuminated by white light perpendicular to its surface. Let t is the minimum thickness of the film. When reflection is taking place at an interface, then the condition for constructive interference is given by :

So, the thickness of the soap bubble is 170 nm.