Question

Objective or Very Short Answer Type Question
(1x10 = 10)
1. Mohan, Sohan and Rahul separately measured the focal length of the same convex lens using the same distant
tree as object. All of them measured the distance between the lens and the inverted image of the tree on the
screen
Mohan obtained a sharp image on the screen and labelled the measured distance as F1
Sohan obtained a slightly smaller and somewhat blurred image on the screen. He labelled the measured distance
As F2
Rahul obtained a slightly magnified and blurred image on the screen. He labelled the measured distance as F3.
The three measured values of focal length are likely to be related as:
(a) F1G2 and F1=F3
[b] F1F2 and Fi<3
F3>f>F2
10 F1F2=72​

Answer 1

Answer:

Option (b) is correct f1 greater than f2 and f1 is less than f3.

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