A pair of glasses on your face produces images that are 4 cm from the lens if the objects are 100 cm away what is the focal length of that l

Question

A pair of glasses on your face produces images that are 4 cm from the lens if the objects are 100 cm away what is the focal length of that lens ?

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bonexptip 4 years 2021-08-08T12:11:35+00:00 1 Answers 8 views 0

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  1. mocmien2
    0
    2021-08-08T12:12:53+00:00
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    Focal Length of the lens is 3.846 cm.

    Explanation:

    Image Distance ( i ) = 4 cm

    Object Distance ( o ) = 100 cm

    Find,

    Focal length =?

    Focal length of pair of glasses can be calculated as –

        1/f = 1/o + 1/i                   ………….  ( here 1 / o it’s o = object distance )

        1/f = 1/100 + 1/4\\\\1/f = 0.26\\\\f = 3.846 cm

    Focal Length of the lens is 3.846 cm.

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