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    Optics - Lens Power

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    Reading glasses of what power (D) are needed for a person whose near point is 121cm, so that he can read a computer screen at 48.8cm? Assume a lens eye distance of 1.83cm.

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    Near point = 121 cm
    screen distance = 48.8.cm

    Because, lens distance from eye = 1.83 cm
    Hence, distance of object (screen) ...

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