A ray of light after refraction through a convex lens emerges parallel to the principal axis. (a) Draw a ray diagram to show it. (b) The incident ray passes through a point F on the principal axis. Name the point F.

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Solution

(a)

(b) The point F is called first principal focus.

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A ray of light after refraction through a convex lens emerges parallel to the principal axis. (a) Draw a ray diagram to show it. (b) The incident ray passes through a point F on the principal axis. Name the point F.

(a) (b) The point F is called first principal focus.

(a)

(b) The point F is called first principal focus.