A sheet of glass having an index of refraction of 1.40 is to becoated with a fil

Question

A sheet of glass having an index of refraction of 1.40 is to becoated with a film of material having an index of refraction of1.55 in order that green light with a wavelength of 525 nm (in air)will be preferentially transmitted via constructive interference a) What is the minimum thickness of the film that will achievethe result? b) why are other parts of thevisible spectrum not also preferentiallytransmitted c) will the transmission of anycolors be sharply reduced? if so what colors? a) What is the minimum thickness of the film that will achievethe result? b) why are other parts of thevisible spectrum not also preferentiallytransmitted c) will the transmission of anycolors be sharply reduced? if so what colors?

Explanation / Answer

The minimum thickness of the film is              t = /2n                = (525nm) / [2(1.55)]                = 169.35nm

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