12. At what distance from a concave mirror of focal length 30 cm should an object placed so that the size
of the image is equal to the size of the object?
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Answer:
ANS . 6Ocm.
Explanation:
when an object placed at centre of curvature,magnification is one that implies height of image is equal to the height of object.
F =R/2
R = 2F
R = 2x 30 = 60cm.
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