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A person can not see object in two ortho...

A person can not see object in two orthogonal direction clearly. It can be removed by using cylindrical lens in particular direction.

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For lens `u=-oo "and" v=-100"cm"`
`therefore (1)/(v) - (1)/(u) = (1)/(f) = (1)/(v) = (1)/(f) implies f = v = -100"cm(concave)" therefore "Power of lens" P = (1)/(f)= -(1)/(1) = -1D`
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