Three students measured the focal length of a convex lens using parallel rays from a distant
object.
All of them measured the distance between the lens and the inverted image on the screen.
Student A saw a sharp image on the screen and labelled the distance as f1 .
Student B saw a slightly larger blurred image on the screen and labelled the distance as f 2.
Student C saw a slightly smaller blurred image on the screen and labelled the distance as f3 .
The relation between the three measurements would most likely:
(a) f1 = f2 = f3 (b) f1< f2 and 3 f (c) f3 < f 1< f 2(d) f1 < f2 and f1=f3