Question

Define power of convex lens ? And what its unit?

Answer 1

Answer:

Convex lens power is defined as the ability of the lens to converge the rays of light which fall on it as shown in the below figure. ... It can mathematically be defined as P = 1f P = 1 f , where f is the focal length. S.I. unit of power is the Diopter.

Explanation:

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Answer 2

Answer:

Power of lens is known as the inverse of the focal length of the lens measured in meter(m). S.I unit of power = Dioptre (D) Power of lense = 1/ focal length in meter. The focal length of 1st lense f1 = 40 cm = 0.4 m. The lense used is a convex lens because the focal length is a positive value.