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24 June, 15:22

A given individual is unable to see objects clearly when he is beyond 60 cm. What power lens should be used to correct this problem? A) - 12.932039 D (B) - 0.74D (C) - 0.828 D (D) - 3.529412 D (E) - 1.667 Diopters

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  1. 24 June, 15:50
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    correct option is E

    power lens is - 1.667 D

    Explanation:

    Given data

    infinity = 60 cm

    to find out

    power lens

    solution

    we know here infinity v = - 60 cm because object at infinity

    and we take u = - infinity

    so we know that

    1/f = 1/v - 1/u

    1/f = 1 / - 60 - 1 / - infinity

    so

    1/f = - 1/60

    f = - 60 cm = 0.60 m

    and we know power of lens = 1/f

    so here

    power = 1 / - 0.60

    power = - 1.667 D

    so correct option is E

    power lens is - 1.667 D
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