Question

SI unit of power of lens is

Answer 1

SI unit of power of the lens

1. The power of a lens is its capacity to diverge or focus light.
2. The ease with which a lens deviates the incident light increases with lens power.
3. The power of a lens is given by the inverse of its focal length i.e. $P=\frac{1}{f}$ where $P$ is the power of the lens and $f$ is the focal length.
4. The SI unit of power of lens is Diopter and is denoted by $D$

Hence the SI unit of power of the lens is Diopter