A convex security mirror has a focal length of -0.25m. A person with a height of 1.5m is 4m from the mirror. calculate the image distance and image height.

Question

AND

An object 0.4m tall is placed 2.5m in front of a convex mirror that has a focal length of -90cm. Calculate image distance and image height.

Answer 1

In each case use the mirror formula

1/do + 1/di = 1/f

do = object distance
di = image doistance

Make sure you use negative f for the convex mirrors. The image height is di/do times the object heeight.

Answer 2

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