Optics Question 89
Question: An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If amg = 1.5, the distance of bubble from refracting surface is
[CPMT 2002]
Options:
A) 1.2 cm
B) 3.2 cm
C) 2.8 cm
D) 1.6 cm
Show Answer
Answer:
Correct Answer: A
Solution:
v = 1 cm, R = 2 cm By using $ \frac{{\mu _{2}}}{v}-\frac{{\mu _{1}}}{u}=\frac{{\mu _{2}}-{\mu _{1}}}{R} $
$ \frac{1}{-1}-\frac{1.5}{u}=\frac{1-1.5}{-2} $
$ \Rightarrow u=-1.2cm $
