A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length.What is the size of the image formed?
A) 5.0 cm
B) 7.2 cm
C) 7.5 cm
D) 30 cm
E) 12 cm

Question

Quizplus · Accepted Answer

The magnification (m) for a mirror is given by the formula m = - (image distance/object distance). For a convex mirror, the image distance (v) can be found using the mirror formula: 1/f = 1/v + 1/u, where f is the focal length and u is the object distance. Solving for v gives v = -16.67 cm. The magnification is then m = -(-16.67/20) = 0.8335. The image height is m * object height = 0.8335 * 6 cm = 5 cm.

A 60 Cm Tall Object Is Placed 20 Cm in Front