Optics Question 992
Question: A fist looking from within water sees the outside world through a circular horizon. If the fish $ \sqrt{7} $ cm below the surface of water, what will be the radius of the circular horizon
[Kerala PMT 2005]
Options:
A) 3.0 cm
B) 4.0 cm
C) 4.5 cm
D) 5.0 cm
Show Answer
Answer:
Correct Answer: A
Solution:
Radius of horizon circle $ =\frac{3h}{\sqrt{7}} $
$ =\frac{3\sqrt{7}}{\sqrt{7}}=3cm $ .
