A camera with a 50.0 mm lens is designed to focus on objects at distances ranging from 1.00 m to infinity. How far must the lens be able to move, relative to the image sensor plane, to focus over this range?
A) 50.0 mm
B) 52.6 mm
C) 47.4 mm
D) 5.30 mm
E) 2.63 mm

Question

Quizplus · Accepted Answer

To find the range of movement, use the lens formula 1/f = 1/v - 1/u. For u = infinity, v = f = 50 mm. For u = 1 m, solve for v: 1/50 = 1/v - 1/1000, giving v ≈ 52.63 mm. The lens must move 52.63 mm - 50 mm = 2.63 mm.

A Camera with a 50