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A point object is placed at a distance of 10 cm from a concave mirror and its real image is formed at a distance of 20 cm from the concave mirror. If the object is moved by 0 .1 cm towards the mirror, calculate the shift of image in mm .

Correct answer

-4

Step-by-step solution

dv = - v 2 u 2 du = - - 2 0 2 - 1 0 2 × 0.1 = - 0.4 cm=-4 mm

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