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

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Solution:

The mirror formula is given as ... (i)
The position of object is left of mirror and position of image is
right of mirror
and substituting values in equation (i)



The radius of curvature is given as