A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens. (a) What special name is given to this point on the principal axis ? (b) Draw a labelled diagram to support answer in part (a).

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Solution

(a) The point is known as the optical centre.
(b)

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A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens. (a) What special name is given to this point on the principal axis ? (b) Draw a labelled diagram to support answer in part (a).

(a) The point is known as the optical centre. (b)

(a) The point is known as the optical centre.
(b)