Question

A lens combination is made from a crown glass in the manner shown. The magnitude of the radius of curvature of each surface of the crown glass is 20 . If the refractive index of the crown glass and flint used are 1.52 and 1.66 respectively, calculate the focal length of the combination.

Answer 1

Here the knowledge of the refractive index is used, please refer to the solution given in the image,

Lens combination is used form a crown glass.

The magnitude of the radius of curvature of each surface of the crown glass is 20. If the refractive index of the crown glass and flint used are 1.52 and 1.66 so solution is provided in the Image