Where does the refracted rays meet when the parallel light rays fall on the bi convex lens at angle with the principal axis?
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A ray of light, after refraction through a convex lens emerges parallel to the principal axis. The incident ray when produced appear to come from a point on principal axis.
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A number of rays parallel to the principal axis are falling on a concave mirror. Observe the reflected rays. They are all meeting/intersecting at a point on the principal axis of the mirror. This point is called the principal focus of the concave mirror.
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