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+2 votes
8.2k views
in Physics by (130k points)

Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?

1 Answer

+1 vote
by (93.7k points)
edited by
 
Best answer

Refractive index of glass, 

Focal length of the double-convex lens, f = 20 cm 

Radius of curvature of one face of the lens = R

Radius of curvature of the other face of the lens = R

Radius of curvature of the double-convex lens = R 

 The value of R can be calculated as:

Hence, the radius of curvature of the double-convex lens is 22 cm.

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