1.

atalyst, WriteTUI tiht Tdaction.01808. Define dioptre. What will be the sign used for finding the power of concave & convex lensIn which defect will a person wear lens with positive power09. Why is alumi

Answer»

1 dioptre is the power of a lens whose focal length is one metre i.e. 1D=1m^-1. Power of a convex lens is positive and that of a concave lens is negative. A person suffering from hypermetropia needs to wear lens with positive power



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