For which of the pairs of $u$ and $f$ for curved mirror(s) the image formed is smaller in size.

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$u = - 45 c m, f = - 10 c m$

$u = - 10 c m, f = 20 c m$

$u = - 60 c m, f = 30 c m$

$u = - 20 c m, f = - 30 c m$

answer is A, B, C.

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Detailed Solution

For convex mirror (having positive focal length) the image is always smaller in size. For concave mirror (having negative focal length) the image is smaller when the object lies beyond $2 f$ .

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