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Question

A person cannot see objects clearly beyond $$2.0\ m$$. The power of lens required to correct his vision will be 


A
+2.0 D
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B
1.0 D
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C
+1.0 D
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D
0.5 D
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Solution

The correct option is A $$-0.5\ D$$
As we know,
$$P=\dfrac 1f=\dfrac{1}{-( defected\ far\ point )}=-\dfrac 12=-0.5\ D$$

Physics

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