Question

plz plz plz............check this question...To construct a ray diagram we use 2 light rays which r so chosen that it is easy to note their direction after refraction from the lens.List the 2 rays and state these rays after refraction..

Answer 1

We can locate the image formed by a lens of a point object by tracing the path of any two rays and finding their point of intersection .All transmitted rays will either pass through or seem to pass through this point of intersection.For convenience,we choose two rays whose paths are known .First we choose, the ray that is incident parallel to the principal axis .In case of convex lens, the transmitted ray will pass through the focus, and in case of concave lens ,the transmitted rays's backward projection will pass through the focus .Then ,we choose the ray that passes through the optical center of the lens . This ray is transmitted without any deviation .The point of intersection of these two transmitted rays is the image of the point object .