Question

7. 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 1

Explanation:

It is a diverging lense .

Answer 2

Power ,

$P = +1.5 D \\\\\ P = \frac {1}{f(in~metres)} \\\\\ or \\\\\ f = \frac {1}{p} = \frac {1}{+1.5} = 0.66 ~ m$

Hence , the lens is a converging lens because it has a positive focal length .