Reza's face is 20 cm in front of a concave shaving mirror having a focal length of magnitude 30 cm. How large is the image of his face?
A) twice as large as his face
B) half as large as his face
C) three times as large as his face
D) of the same size as his face
E) four times as large as his face

Question

Quizplus · Accepted Answer

Using the mirror formula (1/f = 1/v + 1/u) and magnification formula (m = -v/u), we find that the image is three times as large as the object.

Reza's Face Is 20 Cm in Front of a Concave