Answer to Question #37097 in Optics for imran khan
1/d_0 + 1/d_i = 1/f
as the the image is virtual, d_i is negative. And we find:
1/f = 1/60 - 1/20 = -2/60 = - 1/30
Hence, focus is at 30 cm from mirror. Focus and radius of curvature are connected as:
R = 2f = 60 cm.
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