Question

The power of lens is -5D
A) Find it's focal length
B) Name the type of lens

Answer 1

given, power of lens=-5 D

we know that,

P= 1/F

so, -5 = 1/F

-5F = 1

F= - 1/5

F= - 0.2

HENCE, FOCAL LENGTH OF THE LENS IS -0.2 m

since focal length of the lens is negative, so it is a concave lens.

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