Question

What is the nature of a lens having a power of -0.5 Dioptre​

Answer 1

Explanation:

P = -0.5 Dioptre

P = 1/f

-0.5 = 1/f

f = 1/-0.5

f = -2 meter

यह एक अवतल लेंस है।

Answer 2

Answer:

dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D. Thus 1D = 1 m-1. Simply, when focal length ' f ' is expressed in metres, then, power is expressed in dioptres.