The power of a lens is 5D. Find its focal length.

Power of lens (P) = +5D
As we know, the power of the lens is the reciprocal of its focal length.
So, P = 1/f
f = 1/P
= 1/5
= 0.2 m
= 0.2 × 100 cm
= 20 cm
Hence, the focal length is 20 cm.

Was this answer helpful?


4.5 (8)


Choose An Option That Best Describes Your Problem

Thank you. Your Feedback will Help us Serve you better.

Leave a Comment

Your Mobile number and Email id will not be published. Required fields are marked *




Free Class