Question

10. A light bulb burns in front of the center of a 40-cm wide plane mirror that is hung vertically
on a wall. A man walks in front of the mirror along a line that is parallel to the mirror and
twice as far from it as the bulb. The greatest distance he can walk and still see the image of
the bulb is:
A. 20 cm
B. 40 cm
C. 60 cm
D. 80 cm
E. 120 cm

Answer 1

Answer:

Option b ie.40 cm.....

Answer 2

Answer:

E. 120 cm

Explanation:

The man is twice as far away so he walks 80 (2x40) cm plus the width of the mirror.  80 + 40 = 120 cm.  A ray diagram would help with understanding the problem.