For visible wavelengths, the refractive index of a thin glass lens is where and If its
Chapter 31, Problem 81(choose chapter or problem)
For visible wavelengths, the refractive index of a thin glass lens is where and If its focal length is 30 cm at 550 nm, how much does the focal length vary over a wavelength spread of 10 nm centered on 550 nm? (Hint: See 80.)
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