A ray of light, after rerfraction through a concave lens emerges parallel to the principal axis. (a) Draw a ray diagram to show the incident ray when produced meets the principal axis at point F. (b) Name the point F.

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Solution

(a)

(b) The point F is known as the first principal focus.

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A ray of light, after rerfraction through a concave lens emerges parallel to the principal axis. (a) Draw a ray diagram to show the incident ray when produced meets the principal axis at point F. (b) Name the point F.

(a) (b) The point F is known as the first principal focus.

(a)

(b) The point F is known as the first principal focus.