Question: After an eye examination, you put some eye drops on your sensitive eyes. The cornea (the front part of the eye) has an index of

After an eye examination, you put some eye drops on your sensitive eyes. The cornea (the front part of the eye) has an index of refraction of 1.38, while the eye drops 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 eye drops on your cornea?

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

(c) 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 eye drops has the same thickness as in part (a), what wavelengths of visible light will be reinforced? What wavelengths will be cancelled?

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