Question

How are power and focal length of a lens related? 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?​

Answer 1

Answer:

Step-by-step explanation:

P=1/f

We will use lens of focal length 20 cm because it is inversely proportional to convergence of light

Answer 2

Answer:

Power of a lens is reciprocal to its focal length. So, smaller focal length means more power. Out of the given lenses, the lens with 20 cm as focal length has more power than the lens with 40 cm as focal length. The lens with higher power should be used to obtain more convergent light.