Question

What is meant by power of a lens ? When is it positive or negative? Define one dioptre.

Answer 1

Explanation:

power of lens is define as the power of converging and diverging of lens is known as power of lens .

power of lens may be positive and negative both :- convex lens is known as converging lens and it is always in positive and concave lens is diverging lens and it is in always negative .

1 diopter is a unit measurement of optical power a lense or curve mirror which is equal to the reciprocal of focal length of lense measure in meter. (1/m)

Answer 2

Power of lens is the ability to converge or diverge the rays of light while passing through the lens. It is positive for Convex lens. It is negative for Concave lens. One diopter is defined as the power of lens have focal length 1 m .

Explanation:

Power of lens is defined as the ability of any lens to converge or diverge the rays of light while passing through the lens. It is represented by 'P' and given in terms of focal length as  

$Power =\frac{1}{focal length} focal length is in meter(m)$

Power is in Diopter (D) Convex lens is a converging lens and have positive power. Concave lens is a diverging lens and have negative power. One diopter is defined as power when focal length of the lens is one meter.

To know more about power of lens, visit:

RELATION BETWEEN POWER OF LENS AND FOCAL LENGTH https://brainly.in/question/6814101

What do you mean by power of lens how does it depend upon the focal length of lens what does positive and negative power represented please don't right unnecessary answer

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