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Question:

A student has obtained a magnified image of a flame on a screen using a convex lens. To draw the corresponding ray diagram, to show the image formation, which of the following two rays whose paths after refraction are shown she should select?

I and II

II and III

III and IV

I and III

Solution:

The image is formed by the lens when two refracted rays intersect at a point. Thus rays taken from I and III will form an image, and hence option D is correct.