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Q.

A concave mirror has a focal length f = 15 cm. A point object is kept at its centre of curvature. Now mirror is rotated about z-axis through a very small angle  θ=2∘ . Consider paraxial rays only. The approximate distance between object and its image is
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a

π150m

b

π75m

c

π100m

d

π300m

answer is A.

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Detailed Solution

By rotating an angle  'θ' the principal axis of mirror aslo rotated by same angle.

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