Physics
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.
Refraction Lens
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Answer
(a) Below ray diagram shows the incident ray and its corresponding emergent ray:
(b) The point through which the incident ray passes is known as the first focus.
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