The power of the lens used in the reading glasses of a person is 1.5d identify the lens and the focal length
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Similar type of question comes aging, here power(+1.5) is given and focal lenght is required so,
p = 1/f
1.5 = 1/f
f = 1/1.5
f = .67 cm
Hence the required focal length of the lens= 0.67 cm
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