What is the magnification of concave mirror?

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Answer # 1 #

The magnification (M) of a concave mirror is the ratio of the height of the image (h') to the height of the object (h):

M = h'/h = -v/u
where v is the image distance and u is the object distance.

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Answer # 2 #

When the object is at focus, the image is at infinity and magnification is theoretically infinite.

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