Computer Applications
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.
Answer
To get an image of same size the object should be placed at the center of the curvature of a concave mirror.
Given,
focal length = 25 cm
As, centre of curvature = 2 x focal length
Therefore,
centre of curvature
= 2 x 25
= 50 cm
Hence, the object should be kept at 50 cm so that the size of image is equal to the size of object.
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