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Question
Out of the five incident rays shown in the figure find the three rays that are obeying the laws of refraction and may be used for locating the position of image formed by a convex lens:
(A) 1, 2 and 3
(B) 2, 3 and 4
(C) 3, 4 and 5
(D) 1, 2 and 4
Solution
(B)
Rays (2), (3) and (4) obey the laws of refraction.
Ray parallel to the principal axis passes through the second focus of the lens.
Ray passing through the optical center goes undeflected.
Ray passing through the first focus of the lens goes parallel to the principal axis.
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