A film of soapy water (n=1.33) on top of a sheet of crown glass (n=1.52) has a t

Question

A film of soapy water (n=1.33) on top of a sheet of crown glass (n=1.52) has a thickness of 177 nm. what wave length is most strongly reflected if it is illuminated perpendicular to its surface? A film of soapy water (n=1.33) on top of a sheet of crown glass (n=1.52) has a thickness of 177 nm. what wave length is most strongly reflected if it is illuminated perpendicular to its surface? A film of soapy water (n=1.33) on top of a sheet of crown glass (n=1.52) has a thickness of 177 nm. what wave length is most strongly reflected if it is illuminated perpendicular to its surface?

Explanation / Answer

Here ,

refractive index , n = 1.33

thickness of film , t = 177 nm

Now, for strong reflection

wavlength = 2 * n * t

wavelength = 2 * 1.33 *177

wavelength = 470.82 nm

the wavelength which is most strongle reflected is 470.82 nm

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