A person cannot clearly see distance more than 40 cm. He is advised to

1.	A person cannot clearly see distance more than 40 cm. He is advised to use lens of power.
Answer» <P>`-2.5 D` `2.5 D` `-6.25 D` `1.5 D` Solution :For the remedical lens, `U = oo`, V = - 40 cm = - 0.40 m `therefore "" (1)/(f) = (1)/(v) - (1)/(u) = (1)/(-0.40) - (1)/(oo) = - 2.5 RARR P = - 2.5 D`

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A person cannot clearly see distance more than 40 cm. He is advised to use lens of power.

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