How far from a +50-mm focal length lens,such as is used in many 35-mm cameras,must an object be placed so it will form a real image that is 3.0 times the size of the object?
A)46 mm
B)52 mm
C)58 mm
D)67 mm

Question

Quizplus · Accepted Answer

To form a real image that is 3 times the size of the object, the object distance (u) and image distance (v) must satisfy the magnification equation: m = v/u = 3. Using the lens formula 1/f = 1/v + 1/u with f = 50 mm, solve for u to find the correct distance.

How Far from a +50-Mm Focal Length Lens,such as Is