The reflection of a 10.0 cm object appears to be 18 cm tall and 9 cm behind the mirror. what distance is the object from the mirror?

5 cm

Explanation:

From magnification of mirror formula, we have

where, is the height of the image, is the height of the object, u is the distance of the object from mirror and v is the distance of the image from the mirror.

Given:

= 18 cm

= 10.0 cm

v = 9 cm

u = ?

Thus, the object is placed at 5 cm from the mirror.

an obstruction

it is called kinetic energy