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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
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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 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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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.