Question

16. Find the focal length of a lens of power
17. 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

Answer:

focal length(in meter) = 1/power

hence focal length (in CM) = 100/power

f= 100/1.5

since focal length is positive hence lens convex or converging.

Answer 2

Answer:

66.6 cm

Explanation:

The power of the lens is positive so it is converging lens

The formula for the focal length is 1/ power

So focal length = 1/1.5

                           = 0.66 m

                           = 66.6 cm