Question

What is the difference between principle of axix and the principle of focus?

Answer 1

Light - Reflection and refrication Principal focus is a point on the principal axis where the rays which are incident parallel to theprincipal axis meet after reflection.Principal focus is a point on focal plane and is located on the principal axis.

Answer 2

principle focus number 1 of convex Lens is that point on the principle axis, from which all incoming rays, after refraction becomes parallel. principle focus 2 of convex lens is that point on principle axis where, all parallel incoming ray intersect after refraction.

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