An object is placed 21 cm in front of a concave mirror with a focal length of 14 cm, what is the image position?

42 cm

Explanation:

We can solve the problem by using the lens/mirror equation:

where

f is the focal length of the mirror

p is the distance of the object from the mirror

q is the distance of the image from the mirror

In this problem, we have

f = +14 cm is the focal length of the mirror (positive for a concave mirror)

p = 21 cm is the distance of the object

Solving for q, we find the distance of the image:

answer; how far out of place which the object finished relative to the starting location;

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