Question

glass and crown glasses
6. A telescope objective is made by cementing together two lenses so as to make an
achromatic combination of lenses, the cemented surfaces having the same radius of
curvature. The combination of plano-convex lens of focal length 0.60 m. Calculate the
radii of curvature of compound lenses. Given that the refractive index of crown and flint
glasses are 1.5 and 1.6 respectively and their dispersive powers are 0.02 and 0.04
respectively. Plano-concave lens is made of flint and convex lens of crown glass.
[Ans. 0.36 m, 0.26 m, -0.36 m, Infinity​

Answer 1

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