Question

if the focal length of a lens is 100cm,then it's power is​

Answer 1

Answer:

The power of a lens is 1/focal length (measured in meters). So, 50 cm is 1/2 meter, so the power is -2; D stands for diopters, the unit of power for lenses. Hence, the power of a concave lens of focal length 50 cm is -

Explanation:

To calculate the power of a lens needed to focus at a particular distance, first convert that distance into centimeters, then divide 100 cm by that number. The result is the dioptric power.

Answer 2

Answer:

hope this will help you.