Optics Question 646
Question: A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed there are two positions of the lens to form real images. If the heights of the images are 4 cm and 9 cm respectively, the height of the object is
[AMU (Med.) 1999]
Options:
A) 2.25 cm
B) 6.00 cm
C) 6.50 cm
D) 36.00 cm
Show Answer
Answer:
Correct Answer: B
Solution:
$ O=\sqrt{I _{1}I _{2}}\Rightarrow O=\sqrt{4\times 9}=6cm $
