The near point of a hypermetropic person is 50 cm. The focal length of a convex lens used in his spectaclesshould be :
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Given :- u = -25
v = -50
f = ?
Lens formula,
1/f = 1/v - 1/u
= 1/-50 + 1/25
= 1/50
so, f = 50 cm
power, p = 100/f
= 100/50
= +2D
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Answered by
2
Answer:Given :- u = -25
v = -50
f = ?
Lens formula,
1/f = 1/v - 1/u
= 1/-50 + 1/25
= 1/50
so, f = 50 cm
power, p = 100/f
= 100/50
= +2D
Explanation:
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