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Q.

For a long sighted person, least distant of distinct vision is x meter. He wants to read news paper placed at x/2 meter from him. He uses spectacle having lenses of power x D. What is x :

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a

0.5

b

1.5

c

1

d

2

answer is C.

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1f=1v−1uu=−x2,v=−x1f=−1x+2x1f=1xf=1 m

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