A problem from my book-11
A person of height 1.8 m is standing in front of a convex mirror of radius of curvature 0.1 m at a distance of 0.3 m from the pole of the mirror. The principal axis divides his height equally. What must be the minimum perimeter of curved surface of mirror so that he can see his full image?
Assume that the eye level is 1.6 m above his feet. Give your answer to three decimal places.
The answer is 0.157.
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1 solution
Just draw the rsy diagram and use geometry