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To find the focal length of a convex mirror we use indirect method because ,

$(a)\;\text{Image formed by convex mirror is always at infinity } \\(b)\;\text{Image formed by convex mirror is inverted } \\(c)\;\text{Image formed by convex mirror is always virtual } \\(d)\;\text{It focal length is very large} $
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As a convex mirror always forms virtual images,its focal length cannot be found directly , so indirect method is used such as an auxillary convex lens is introduced.
Hence c is the correct answer.
answered Mar 19, 2014 by meena.p

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