A contact achromatic doublet ( with focal length f y in the yellow) is made from

Question

A contact achromatic doublet ( with focal length fy in the yellow) is made from two types of glass. crown

glass which has a refractive index of 1.50768 for red light (n1R), 1.50100 for yellow light (n1Y)) and 1.52321

for blue light (n1B), and the flint glass which has a refractive index of 1.61211 for red light (nR2), 1.62300 for

yellow light (n2Y) and 1.63758 for blue light (n2B). It is designed to act as an achromat for red and blue light.

If the crown glass is biconvex, find the radii of curvature for all four surfaces which comprise the doublet, if

the compound lens is to have a focal length (fy) of 15cm.

could you please show me how you got the answer. will give lifesaver

Explanation / Answer

THIS WILL HELP YOU http://rohr.aiax.de/chapter 4b.htm

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