Question

The _________ of a convex lens is positive thus the spectacles used to correct farsightedness has

positive power.

(a) focal length (b) principle focus

(c) principle axis (d) radius​

Answer 1

Answer:

Convex lenses

Convex lenses are used in eyeglasses for correcting farsightedness, where the distance between the eye's lens and retina is too short, as a result of which the focal point lies behind the retina. Eyeglasses with convex lenses increase refraction, and accordingly reduce the focal length.

Answer 2

Answer:

focal length is the answer to your question