Binoculars and Microscopes Are Frequently Made with Coated Optics by Adding

Binoculars and microscopes are frequently made with coated optics by adding a thin layer of transparent material to the lens surface as shown, in order to improve light transmission. One wants:

A) constructive interference between waves 1 and 2
B) destructive interference between waves 3 and 4
C) constructive interference between waves 3 and 4
D) the coating to be more transparent than the lens
E) the speed of light in the coating to be less than that in the lens

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