Optics Question 638
Question: Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index of 1.25 will be
[CBSE PMT 1993]
Options:
A) 10 cm
B) 2.5 cm
C) 5 cm
D) 7.5 cm
Show Answer
Answer:
Correct Answer: C
Solution:
$ \mu =\frac{\sin i}{\sin \frac{A}{2}} $ cm
