nterlerence Antireflection coatings can be used on the inner surfaces of eyeglas

Question

nterlerence Antireflection coatings can be used on the inner surfaces of eyeglasses to reduce the reflection of stray light into the eye, thus reducing eyestrain a. A 90-nm-thick coating is applied to the lens. What must be the coating's index of refraction to be most effective at 480 nm? Assume that the coating's index of refraction is less than that of the iens h If the index of refraction of the coating is 1.38, what thickness should the coating he so as to be most effective at 480 nm? The thinnest possible coating is best ight that enters your eyes is focused to form an image on your retina The optics of your visual

Explanation / Answer

the thickness of the film t = lambda/4

Wavelength within the film = 457/n nm.

(457/n)/4 = 90

457/4n = 90

n = 457/4/81 = 1.27

(b)

given refractive index = 1.38

thichess = t = lambda/4n

t = 83 nm

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