Question:
A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
Answer:
We have, Power = +1.5 D
We know,
Power = 100/f
or, 1.5 = 100/f
or, f = 100/1.5 = 66.6
The focal length of the lens = 66.6 cm
The prescribed lens is converging.
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