1.

A lens of power 16 D is used as a simple microscope. In order to obtain maximum magnification, at what distance from the lens should a small object be placed? (a) 5 cm (b) 10 cm (c) 16 cm (d) 25 cm

Answer»

Correct Answer is: (a) 5 cm

f = 100 cm/16 = 6.25 cm

Maximum magnification is obtained when the image is formed at D = 25 cm.

Thus, v = -25 cm.

1/v - 1/u = 1/f gives u = - 5 cm.



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