The power of a lens with focal length 20cm is..
Answers
Answered by
3
The power of a convex lens is positive and that of a concave lens is negative. Thus a convex lens of focal length 40 cm is said to possess a power of + 2.5 dioptre. similarly the power of a concave lens of focal length 20 cm is 5.0 dioptre.
Answered by
3
it will 5.0 diopter
if its helped you then thanks me
if its helped you then thanks me
Similar questions