Light is incident in air on a camera lens that has a thin film coating its outer

Question

Light is incident in air on a camera lens that has a thin film coating its outer surface (the film is shown cross-hatched). The lens is made of glass of index 1.50. The transparent film has an index of refraction of n = 1.25. What minimum thickness of film would produce a maximum in transmitted light assuming 500 nm light is incident normally on the lens? Displays a curved cross-hatched surface, half of an elipse, above an area labeled glass n = 1.5. Three rays are directed down above the surface. 83 nm 125 nm 100 nm 200 nm 167 nm

Explanation / Answer

let t is the minimum thickness of the film for constructive interefrence,

2*mue*t = lamda (here mue is the refractive index of the film)

t = lamda/(2*mue)

= 500 nm/(2*1.25)

= 200 nm <<<<<<<<--------------Answer

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