I don't understand how refraction and reflection of light are used to make humans and objects visible to the human eye.

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Trinidad TremblayLv2

28 Sep 2019

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Antireflection coatings can be used on the inner surfaces ofeyeglasses to reduce the reflection of stray light into the eye,thus reducing eyestrain.

PART A) A 90-nm-thick coating is applied to the lens. What must bethe coating's index of refraction to be most effective at 480 nm?Assume that the coatingâs index of refraction is less than that ofthe lens. n = _____ .

PART B) If the index of refraction of the coating is 1.38, whatthickness should the coating be so as to be most effective at 480 ?The thinnest possible coating is best.
t = _____ nm .

Antireflection coatings can be used on the inner surfaces ofeyeglasses to reduce the reflection of stray light into the eye,thus reducing eyestrain.
If the index of refraction of the coating is 1.38, what thicknessshould the coating be so as to be most effective at 480 {\rm nm}?The thinnest possible coating is best. answer in nm.

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