Question

Which of the following changes would increase the focal length of a lens? a) decrease rodius of curvature of surfoce c) increase index of refraction of lens material. d) use red colored lens material b) increase radius of curvature of surface

Answer 1

Increase the radius of curvature of surface.

Step-by-step explanation:

Radius of curvature is the measurement that is two times the focal length, for a given lens. It lies on either side of the lens.

Focal length is the distance which is half of the radius of curvature. Radius of curvature is a measure of the radius of the circle . Focal length is the distance between the center of curvature of the lens and the point where all the rays are brought to a focus for a distant object.