At what distance from a concave mirror of focal length 30 cm should an object be placed?

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At what distance should an object be placed in front of concave mirror of focal length 50cm so that an image of triple of its size is formed

At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object. 

The size of the image is equal to the size of the object if the object is placed at the centre of curvature of a concave mirror.

Hence, the object should be placed at 50 cm. 

Concept: Spherical Mirrors

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