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  • Figure given below shows a beam of light converging at point P. When a concave lens of focal length 16cm is introduced in the path of the beam at a place O shown by dotted line such that OP becomes

Figure given below shows a beam of light converging at point P. When a concave lens of focal length 16cm is introduced in the path of the beam at a place O shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance x from the lens. The value x will be equal to

.

Option: 1

12cm


Option: 2

24/3cm


Option: 3

36/5cm


Option: 4

48/7cm


Answers (1)

best_answer

From the figure shown it is clear that

For lens: u = 12cm and v = x = ?

\mathrm{By ~using ~\frac{1}{f}=\frac{1}{v}-\frac{1}{u} ~we~ have~ \frac{1}{+16}=\frac{1}{x}-\frac{1}{+12}}

\mathrm{\Rightarrow \mathrm{x}=48 / 7 \mathrm{~cm}.}

 

Posted by

Rishabh

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