A) water > glass > diamond
B) diamond > glass > water
C) diamond > water > glass
D) water > diamond > glass
Correct Answer: A
Solution :
Key Idea: Refractive index of diamond is highest and of water is lowest here. If c is velocity of light in vacuum and v in a specific medium, then the refractive index of medium is \[n=\frac{c}{v}\] \[\Rightarrow \] \[v=\frac{c}{n}\] \[\Rightarrow \] \[v\propto \frac{1}{n}\] \[_{^{n}(diamond)}=2.41,\,\,{{n}_{(glass)}}=1.5,\,{{n}_{(water)}}=1.33\] \[\therefore \] \[{{v}_{W}}>{{v}_{G}}>{{v}_{D}}\].
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