Question

What will be the focal length of a lens whose power is given as + 2.0 diopter?

Answer 1

power = 1/f

f = focal length ( in meter )

power is +2.0

f = 1/2.0

= 1/2 .i.e. 0.5

f = 0.5 meter

focal length is 0.5 m or 50 cm

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