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in Physics by (64.1k points)

A sphere is placed in front of a convex lens of focal length f. The radius of the sphere is much smaller compared to f. The image of the sphere would look spherical if the object distance is

(a)   f

(b)  3f/2

(c)  2f

(d)  f/2

1 Answer

+1 vote
by (61.3k points)
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Best answer

Correct option (c) 2f

Explanation:

Lateral magnitude = v/u;

Mag. along axis = |dv/du| = u2/v2 = 1 If v = u, 

∴ u = 2

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