Question

Focal length of a lens; metre, then for power of a lens____________ (Fill in the blank)

Answer 1

Answer:

1 Diopter

Explanation:

• power of Len is equal to 100÷f where f in cm

Answer 2

Explanation:

Focal length of a lens; metre, then for power of a lens will be one dioptre.

A diopter is an optical power measurement unit of a lens or curved mirror that is equal to the reciprocal focal length measured in meters. It is, therefore, a reciprocal longitudinal unit. For instance, a 3-diopter lens provides 1⁄3 meter of parallel light rays to focus.

The measurement of the Dioptre, is with most values ranging from + 0.50 to + 3.50 and going up in 0.25 steps.