The nearer point of hypermetropic eye is `40 cm`. The lens to be used for its correction should have the power
The nearer point of hypermetropic eye is `40 cm`. The lens to be used for its correction should have the power
A. `+1.5 D`
B. `-1.5 D`
C. `+2.5 D`
D. `+0.5 D`
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Correct Answer - C
Hypermetropia is corrected by using convex lens.
Focal length of lens used `f = + ("defected nera point")`
`f = +d = +40 cm`
`:. "Power of lens" = (100)/(f("cm")) = (100)/(+40) = +2.5D`
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