an object is placed at 20 cm in in front of a concave mirror produces three times magnified real image . what is the focal length of the concave mirror
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v=60 since u=20 and mag is x3 [M=v/u]
1/u + 1/v = 1/f
1/f = 1/20 + 1/60 = 4/60 = 1/15
f = 15 cm.
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