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A person cannot see the objects distinct...

A person cannot see the objects distinctly, when placed at a distance less than `100 cm`. What is the power of the spectacles that he should use to see clearly the objects placed at `25 cm` ?

A

`+ 0.3 D`

B

`+ .0 125 D`

C

`− 0.3 D`

D

`+ 0.4 D`

Text Solution

Verified by Experts

The correct Answer is:
A
`P = (1)/(f) = (1)/(v) - (1)/(u) = - (1)/(100) + (1)/(25) = (3)/(100) ( (because v = - 100 cm),(u = - 25 cm )) `
`rArr P = (100)/(f (cm)) = (3 xx 100)/(100) = + 3D `.
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