If the power of a lens is +5 diopters, what is its focal length?
If the power of a lens is +5 diopters, what is its focal length?
Explanation
Focal length (in meters) = 1 / Power (in diopters)
f = 1 / 5
= 0.2 m
=20 cm
Focal length (in meters) = 1 / Power (in diopters)
f = 1 / 5
= 0.2 m
=20 cm