A short linear object of length L lies on the axis of a spherical mirror of focal length f at a distance u form the mirror. Its image has an axial length L’ equal to

Options

(a) L[f/u-f] ¹∕₂
(b) L[u+f/f]¹∕₂
(c) L[u-f/f]²
(d) L[f/u-f]²

Correct Answer:

L[f/u-f]²

Explanation:

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