A lens of focal length 20 cm has an object of height 3.0 cm placed 100 cm in front of it. The image formed is
A)upright and smaller than the object.
B)inverted and smaller than the object.
C)inverted and larger than the object.
D)upright and larger than the object.
E)upright and the same size as the object.

Question

Quizplus · Accepted Answer

The lens formula (1/f = 1/v - 1/u) can be used to find the image distance (v). With f = 20 cm and u = -100 cm, the image distance v is positive, indicating a real image. The magnification (m = -v/u) is less than 1, indicating the image is smaller and inverted.

A Lens of Focal Length 20 Cm Has an Object