With the help of a suitable diagram, explain the meaning of terms
(a) centres of curvature (b) optical centre (c) focus
Answers
Answer: The diagram shows a convex lens
( a ) Centre of curvature - center of curvature of a curve is found at a point that is at a distance from the curve equal to the radius of curvature lying on the normal vector. It is the point at infinity if the curvature is zero. The osculating circle to the curve is centered at the centre of curvature
( 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.
( c ) Focus - also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle.
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Answer:
centre of curvature
optical centre
