Find the focal length of a lens of power -2.0 D. What type of lens is this?

by Doubtly (98.9k points) in Light – Reflection and Refraction asked Dec 15, 2021 354 views

edited Jun 29, 2023

Find the focal length of a lens of power -2.0 D. What type of lens is this?

1 Answer

by Doubtly (98.9k points) answered Dec 15, 2021

by Doubtly selected Jun 29, 2023

Power of lens, P= 1/f
P= -2D
f= -1/2 = -0.5 m
A concave lens has a negative focal length. Hence, it is a concave lens.

...