Question

Two convex lenses A and B have powers P1 and P2 respectively and P2 is greater than P1 Draw a ray diagram for each lens to show which one will be more converging Give reason for your answer

Answer 1

Explanation:

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Answer 2

Lens B will be more converging.

Explanation:

Given that :

lenses A & B have power $P_1\ \&\ P_2$ respectively.

Also the power $P_2>P_1$.

As we know that the power of a lens is given as the reciprocal of the focal length in meters.

$P=\frac{1}{f}$

So, $f_1>f_2$

and hence the lens B will be more converging due to shorter focal length.

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TOPIC: power of thin lens

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