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Question: White light is incident normally on a glass surface (n = 1.52) that is coated with a film of mg F<su...

White light is incident normally on a glass surface (n = 1.52) that is coated with a film of mg F2 (n = 1.38). For what minimum thickness of the film will yellow light of wavelength 550 nm (in air) be missing in the reflected light ?

A

99.6 nm

B

49.8 nm

C

19.6 nm

D

10.6 nm

Answer

99.6 nm

Explanation

Solution

2t =

tmin = 5.5×10−74×1.38\frac { 5.5 \times 10 ^ { - 7 } } { 4 \times 1.38 } = 99.6 nm