1.

Define the principal focus of a spherical lens ?​

Answer»

al lens------ it is a point on principal axis where LIGHT rays parallel to each othe and parallel to principal axis after refeaction either meet actually on other side(in case of convex lens or CONVERGING lens) or appears to meet o same side(INCASE of concavelens or divergimg lens) as that of OBJECT is called as principal focus of SPHERICAL lenses



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