164 is 33 cm The radius of curvature of the curved side of a

1.64) is 33 cm. The radius of curvature of the curved side of a plano-convex lens made of glass (n What is the focal length of the lens? A) 21 cm B)-52 cm C) -21 cm D) 52 cm

Solution

USing the Lens Maker formula:

1/f = (n-1)*(1/R1 - 1/R2)

here R2 = infinity

R1 = 33 cm

n = 1.64

So, 1/f = (1.64 -1)*(1/33 - 0)

So, f = 51.6 cm = 52 cm <-----answer