Optics Question 588
Question: A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be
[MP PET 1991]
Options:
A) 1/4 cm
B) 8 cm
C) 12 cm
D) 20 cm
Show Answer
Answer:
Correct Answer: B
Solution:
$ O=\sqrt{I _{1}I _{2}}=\sqrt{4\times 16}=8cm $
