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A 16 cm long image of an object is formed by a convex lens on a screen placed normal to its principal axis. On moving the lens towards the screen, without changing the positions of the object and the screen, a 9 cm long image is formed again on the screen. The size of the object is:
Option: 1
9 cm

Option: 2
11 cm

Option: 3
12 cm

Option: 4
13 cm.

Answers (1)

best_answer

$\mathrm{ y=\sqrt{y_1 \times y_2} \\ }$

$\mathrm{ =\sqrt{16 \times 9} \\ }$

$\mathrm{ =4 \times 3=12 \mathrm{~cm} . }$

Posted by

manish painkra

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