After an eye examination, you put some eyedrops on your sensitive eyes. The corn

Question

After an eye examination, you put some eyedrops on your sensitive eyes. The cornea (the front part of the eye) has an index of refraction of 1.38, while the eyedrops have a refractive index of 1.45. After you put in the drops, your friends notice that your eyes look red, because red light of wavelength 600 nm has been reinforced in the reflected light.

a) What is the minimum thickness of the film of eyedrops on your cornea?
t = ___________ nm

b) Will any other wavelengths of visible light be reinforced in the reflected light?

c) Will any be cancelled?

d) Suppose you had contact lenses, so that the eyedrops went on them instead of on your corneas. If the refractive index of the lens material is 1.50 and the layer of eyedrops has the same thickness as in part A, what wavelengths of visible light will be reinforced?

e) What wavelengths will be cancelled?

Explanation / Answer

A) 103 nm

B) No other visible wavelenght are reinforced

C) There are no visible wavelengths for which there is destructive interference

D) There are no reinforeced wavelengths

E) 600nm

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