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25/09/2021 5:55 pm
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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?
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25/09/2021 5:57 pm
Given: P = +1.5 D, f = ?
∴ Focal length, f = \(\frac{100}{P}\) = \(\frac{100}{1.5}\)
= 66.6 cm
The prescribed lens is a converging lens because its focal length is positive.