1.

Find the focal length of a lens of power -2.0 D. What type of lens is this ?

Answer»

Solution :Given that power of LENS P = -2.0 D
As power `P = (1)/(F)`, hence focal LENGTH of lens `f = (1)/(P) = (1)/(-2.0 D) = - 0.5 m`
The -ve sign of focal length MEANS that the lens is a concave lens.


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