A) 1.2
B) 1.5
C) 1.8
D) 2.0
Correct Answer: D
Solution :
[d] For spherical surface using \[\frac{{{n}_{2}}}{v}-\frac{{{n}_{1}}}{u}=\frac{{{n}_{2}}-{{n}_{1}}}{R}\] \[\Rightarrow \] \[\frac{n}{2R}-\frac{1}{\infty }=\frac{n-1}{R}\] \[\Rightarrow \] \[n=2n-2\] \[\Rightarrow \] \[n=2\]
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