Question

The power of the lens used in the reading glasses of a person is 1.5d identify the lens and the focal length

Answer 1

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