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  • A long image of an object is formed by a convex lens on a screen placed normal to its p

A 16 \mathrm{~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 \mathrm{~cm}  long image is formed again on the screen. The size of the object is:

Option: 1

9 \mathrm{~cm}


Option: 2

11 \mathrm{~cm}


Option: 3

12 \mathrm{~cm}


Option: 4

13 \mathrm{~cm}


Answers (1)

best_answer

\mathrm{y=\sqrt{y_{1}{}'\: y_{2}} }
=\sqrt{16^{\prime} 9}
\mathrm{=4^{\prime} 3=12 \mathrm{~cm}}.

Posted by

manish painkra

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