First slide

Spherical refracting surface's

Question

The radius of curvature of the convex face of a planoconvex lens is 12 cm and its refractive index is 1.5. What is the focal length of the lens?

Moderate

A

12 cm
B

18 cm
C

24 cm
D

30 cm

Solution

$\frac{1}{f_{1}} = (μ - 1) \frac{1}{R} = (1 .5 - 1) \frac{1}{12} = \frac{1}{24}$
or $f_{1} = 24 cm$ which is choice (3).

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