Question

Define power of lens . define its s.I . unit. Name the instrument ured to measure power of aliens

Answer 1

Power of a lens is it's ability to converge or diverge light Ray's falling on lens so that the object can be seen clearly.

It's S.I unit is Dioptre or D.

The power of Lens is said to be one Dioptre if the focal length of the eye lens is 1 m.

Focimeter is used to measure power.

Answer 2

Answer:

•Power of a lens is its ability to converge or diverge the rays of light falling on it. Power of lens is equal to reciprocal the focal length of the lens. SI unit of power I'd dioptre (D)

•Focimeter is used to measure Power