Question

two lens of focial length 30cm and 40cm were given to you .which lens has more power and why ?​

Answer 1

Explanation:

hope u understood.........

Answer 2

Answer:

You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light ?

P=

f

1

,P∝

f

1

Power of a lens is inversely proportional to its focal length therefore lens having focal length of 20 cm will provide more convergence.

We know that Power of lens is defined as the efficiency with which a lens can converge or diverge the light ray. Therefore the lens with focal length 20cm will have more power than the lens with focal length 30cm. Therefore the lens with focal length 20cm will give more convergent light.