How far should the object be placed from a convex mirror of

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SSC JE CE 2016 Set 2 (Non Technical0
General Intelligence and Reasoning
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General Intelligence and Reasoning

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How far should the object be placed from a convex mirror of focal length 40 cm, when the image is to be obtained at a distance of 8 cm from the mirror?

[SSC JE CE 2016 Set 2 (Non Technical0]

A 12 cm

B 15 cm

C 8 cm

D 10 cm