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Sol. For the near sighted person, v = distance of image from glass = distance of image from eye – separation between glass and eye = 25 cm – 1cm = 24 cm = 0.24m So, for the glass, u = ∞ and v = – 24 cm = –0.24m So, 1/f = 1/v – 1/u = 1/-0.24 – 1/∞ = - 4.2 D
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