Question

# Define 1 dioptre of power of a lens.

Open in App
Solution

## 1 dioptre of power: 1 dioptre of lens power is defined as the unit of measurement of a lens's or curved mirror's optical power equal to the reciprocal of focal length ($f$).$P=\frac{1}{f}=1D$ The focal length is measured in metres.The SI unit of lens power is dioptre, which has a focal length of one metre and is denoted by the letter $D$.

Suggest Corrections
37
Explore more