If focal length of a convex lens is 50cm, power of lens will be how much?

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Sep 25, 2015

Answer:

#+2D#.

Explanation:

To calculate the power of a lens, use the formula
Power= #1/f#
Where #f# is the focal length which is measured in metres.

To answer your question, first we need to convert #50cm# to metres.
#50cm=0.5m#

Power#=1/0.5#
Power#=+2D#
(#D# is the symbol for Diopter, the unit for power of lenses.)

Note that the answer must have a positive (#+#) sign as it is a convex lens. If you were to calculate the power of a concave lens, the answer would be in negative form.

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