A person's far point is at `2 m`. Find nature, focal length and power of the lens he must use to see distant objects clearly.
Text Solution
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Here, the distance of far point, `x = 2 cm`. This defect can be corrected by using a concave lens of focal length `f = - x = - 2m` `P = (1)/(f) = (1)/(-2) Diaptre = - 0.5 D`
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