Question

what is difference between first principal focus and second principal focus in convex lens


gįvę ťhãńkš = ťąkê ťhąñkś

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Answer 1

Answer:

Second principal focus and second focal length : It is a fixed point on the principal axis such thatthe light rays incident parallel to the principal axis, after refraction throughthe lens, either converge to this point (in convex lens) or appear to diverge from this point (in concave lens).