A doubly convex thin lens is made of glass with an index of refraction of 1.52. The radii of curvature of the faces of the lens are 60 cm and 72 cm. What is the focal length of the lens?
A)70 cm
B)63 cm
C)75 cm
D)66 cm
E)58 cm

Question

Quizplus · Accepted Answer

The focal length of a lens can be calculated using the lensmaker's equation: 1/f = (n - 1) * (1/R1 - 1/R2). Substituting n = 1.52, R1 = 60 cm, and R2 = -72 cm (since the lens is convex on both sides), we find f ≈ 63 cm.

A Doubly Convex Thin Lens Is Made of Glass with an Index