Question

which reference to convex lens define the following term focal length radius of curvature optical centre ​

Answer 1

(i) Optical center is defined as the point on the lens which is on the principal axis and the light ray doesn't deflect when passes through it.

(ii) Centre of curvature is defined as the center of the surface of sphere of which the lens is a part. Since, a lens has two surfaces, so the lens has two centers of curvatures.

Answer 2

Answer:

Explanation:

1.focal length: Focal length is distance over which the parallel rays either converge or diverge. ... Thus, for convex lens, the focal length is a distance over which all the parallel rays will converge

2.radius of curvature:  Radius of curvature is the linear distance between the pole and the centre of curvature.

3. Optical Centre : The optical centre is defined as the geometric centre of the convex lens .