Question

definition of power of lenses​

Answer 1

Answer:

The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres..

Explanation:

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Answer 2

Required Answer :

• The power of a lens is defined as the reciprocal of the focal length.

• Converging (convex ) lenses have positive focal lengths, so they also have positive power values.

• Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.

• Power of a lens is the ability to converge or diverge the ray of light falling on it.

• Power of a lens is defined as reciprocal of focal length of the lens.

• A lens of small focal length has large power of converging or diverging a parallel beam of light.

• Power of lens is defined as ability of a lens to converge / diverge a beam of light rays falling on lens .

• Power of lens is reciprocal of focal length where p is power of lens and f is focal length. S.l. unit of power is dioptre (D).