A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of power

+ 0.5 D

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– 0.5 D

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+ 0.2 D

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– 0.2 D

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Solution

The correct option is B – 0.5 D
$P = \frac{1}{f}$
$\Rightarrow P = \frac{1}{2} m = 0.5 D$
A concave lens must be used, therefore power should be – 0.5 D

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A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

(a) + 0.5 D
(b) – 0.5 D
(c) + 0.2 D
(d) – 0.2 D

Q. A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power ___ D.

Q. A person cannot see distinctly objects kept beyond

2

m

. This defect can be corrected by using a lens of power:

Question 1
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

(a) + 0.5 D
(b) – 0.5 D
(c) + 0.2 D
(d) – 0.2 D

Q. A myopic person can not see objects lying beyond

2 m

. The focal length and power of the lens required to remove this defect will be

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A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of power

The correct option is B – 0.5 DP=1f ⇒P=12m=0.5D A concave lens must be used, therefore power should be – 0.5 D

The correct option is B – 0.5 D
$P = \frac{1}{f}$
$\Rightarrow P = \frac{1}{2} m = 0.5 D$
A concave lens must be used, therefore power should be – 0.5 D