Question

find the focal length of a lens of power -2.0 D . what type of lens is this?​

Answer 1

here is yøur answer

So, the focal length of the lens is 5 cm. The focal length of a convex lens is positive. So, it is a convex lens.

Answer 2

Answer:

f = 1/power

f = -1/2

f = -0.5 m

concave lense