Question

Double convex lenses are to be manufactured from a glass of refractive index 1.55 with both force of the same radius of curvature . what is the radius of curvature required if the focal length of the lens is to be 20 cm ?​

Answer 1

Answer:

Answer refer in Attachment.

Thank you

Answer 2

1/f=(m-1)

1/20=1.55-1

1/20=0.55*2/r

r=0.55*2*20

 = 22.0 cm.