You are asked to design a shaving mirror assuming that a person keeps it `10cm` from his face and views the magnified image of the face at the closest comfortable distance of `25cm`. The radius of curvature of the mirror would then be:

Answer

A

Explanation

`(1)/(f) = (1)/(25) + (1)/(-10) = (10 - 25)/(10+ 25)`
`implies f = (-50)/(3)`
`R = 2f = -(100)/(3) = -33.33 cm`