A person wants to read a book placed at 20 cm whereas near point of the eye is 30cm find the power of lens required.
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a) when focal length is 20cm
then power is 5 dioptre
b) when focal length is 30cm
the power is 3.3 dioptre.
then power is 5 dioptre
b) when focal length is 30cm
the power is 3.3 dioptre.
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