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Q.
Q. 1. 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 f2.
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 be
(a) f1 = f2 = f3.
(b) f1 < f2 and f3.
(c) f3 < f1 < f2.
(d) f1 < f2 and f1= f3.
Answer:
(c) f3 < f1 < f2.
Q.2 What is the resistance of an open key? And why?
A. Zero
B. One
C. Infinite
D. None of these.
Answer:
c.infinite
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2 comments:
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