Unit of power of lens is -  

The correct answer is Diopter.

Explanation:

• The unit of power of a lens is the diopter, abbreviated as "D." 
• The power of a lens is a measure of its ability to converge or diverge light and is the reciprocal of its focal length measured in meters.
• The formula to calculate the power of a lens is:

\( {\text{P}} = \frac{{{\text{1}}}}{{{\text{f}}}}\)

• Where P is the power of lens and
• f is the focal length.

Thus, Unit of power of the lens is Diopter.

Additional Information Meter

• The meter (m) is the SI unit of length, which is used to measure the length or distance.

Centimeter

• The centimeter (cm) is a unit of length or distance.
• It is commonly used for measuring relatively shorter lengths.

Kilometer

• The kilometer (km) is a unit of length or distance in the International System of Units (SI).
• It is a metric unit used to measure longer distances.