Question

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

Answer 1

Answer:

p = 1/f (in metres)

Explanation:

power is equal to the reciprocal of focal length ( in metres)

Answer 2

You are provided with two lenses of focal length 20 cm. P = 1/f (in m). More the power of a lens more is its converging power. Thus, the lens of shorter focal length will have more converging power.