Question

Explain Power of a Lens. and also follow me . My friends ​

Answer 1

Explanation:

If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D).

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.

Example 1

What is the power of a convex lens with a focal length of 25 cm?

First convert focal length into metres: f = 25 cm = 0.25 m

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Answer 2

Answer:

if a lens has a shorter focal length.it is said to be more powerful.the power of a lens is defined as the power of a reciprocal of the focal length.