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Mon January 07, 2013 By:

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Expert Reply
Mon January 07, 2013
we know that 1/v + 1/u = 1/f . as the miror is convex then focal leanth is -ve and image distance is -ve. then the equation stands -1/v + 1/u = -1/f . here v=u/2. then -2/u + 1/u = -1/f => f=u
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