Question

Focal length of four convexs lenes is p,q,r,s are 20,15,5,10 which lens have greatest power

Answer 1

Answer:

the focal length 5 has highest power as we know that focal length and power is inversely proportional

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Answer 2

Answer:

r ,the one with f=5

Explanation:

The power of a lens is  $P = \frac{1}{f}$ .

So smaller the focal length larger the focus.

Thus, the greatest power is the one with smallest focal length.