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Optical Path Length

a thin film o...

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a thin film of water (u=4/3) is 3100Å thick. If its illuminated by white light at normal incidence. The colour of film in the reflected light will be what ?

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Q. A water film having a refractive index of 1.33 in air is 320 nm thick. If it is illuminated with white light at normal incidence, the light of what wavelength (in nm) will appear to be in reflected light?

Q. Assertion: Thin films such a soap bubble or a thin layer of oil on water show beautiful colours when illuminated by white light.
Reason: It happens due to the interference of light reflected from the upper surface of the thin film.

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