1 a lens in lick observatorys 36-inch refracting telescope, Ask an Expert

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1. A lens in Lick Observatory's 36-inch refracting telescope has a thickness of 1.96 inches at its center and an index of refraction n=1.52. Consider blue light (450 nm) passing through the lens.

(A) What is the light speed in the lens?

(B) How long does it take light to travel through this lens at the center?

(D) How many wavelengths of the incoming blue light fit across the lens at any instant?

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