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Study the following ray diagrams: I.
II.
III.
IV.
The diagrams showing the correct path of the ray after passing through the lens are:(a) II and III only(b) I and II only(c) I
(c) I, II and III
Explanation
Fig. I. According to the rules for obtaining images formed by a convex lens, "A ray of light passing through the optical centre $(O)$ of the lens goes straight after refraction through the lens.
Fig. II. According to the rules for obtaining images formed by a convex lens, "A ray of light which is parallel to the principal axis of a convex lens, passes through its focus $(F)$ after refraction through the lens.
Fig. III. According to the rules for obtaining images formed by a convex lens, "A ray of light passing through the focus $(F)$ of a convex lens becomes parallel to its principal axis after refraction through the lens.
And, there are only these three rules for obtaining images formed by a convex lens.
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