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 177nm. What wavelength is most strongly reflected if it is illuminated perpendicular to its surface? (This is the apparent color of the soapy film.) A film of soapy water (n=1.33) on top of a sheet of crown glass (n=1.52) has a thickness of 177nm. What wavelength is most strongly reflected if it is illuminated perpendicular to its surface? (This is the apparent color of the soapy film.) A film of soapy water (n=1.33) on top of a sheet of crown glass (n=1.52) has a thickness of 177nm. What wavelength is most strongly reflected if it is illuminated perpendicular to its surface? (This is the apparent color of the soapy film.)

Explanation / Answer

Given ns = 1.33

ng=1.52

t = 177 nm= 177e-9 m

Wavelength can be calculated by

wavlength (lamda)= 2nst = 2 * 1.33 *177

Strongly reflected wavelength = 470.82 nm

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