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An object is placed in front of a concave mirror of focal length 20 cm.

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An object is placed in front of a concave mirror of focal length 20 cm. The image formed is three times the size of the object. Calculate two possible distances of the object from the mirror.

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m = + 3 and m = – 3; f = – 20 cm 

When, m = 3 

m = \(\frac{v}{u}\) = 3 

v = – 3 u 

From mirror equation,

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