Question

4.
With the help of a suitable diagram, explain the meaning of terms:
(a) centres of curvature (b) optical centre (c) focus​

Answer 1

Answer:

centre of curvature::it is a point that is at the distance from the curve (outer region)to the region where the centre lies..

b) optical centreit is the point which lies on the axis of the lens that is located that any any of light ...passes without net deviation

c) focus:also termed image point,a region where the light ray orginating from from a point object or an object converges

Explanation:

Remember☝️each terms are different u must check it appropriately...(mirror or lens)

Answer 2

Explanation:

Answer. ( b ) Optical centre - is a point on the axis of a lens that is so located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be within, without, or on either surface of the lens.