A) \[3.8\times {{10}^{8}}m/s\]
B) \[3.38\times {{10}^{8}}m/s\]
C) \[2.12\times {{10}^{8}}m/s\]
D) \[1.56\times {{10}^{8}}m/s\]
Correct Answer: C
Solution :
[c] Refractive index, \[\mu =\frac{\sin 45{}^\circ }{\sin 30{}^\circ }\] \[\mu =\frac{1}{\sqrt{2}}\times 2=\sqrt{2}\] Now, \[\mu \text{=}\frac{\text{Velocity}\,\,\text{of}\,\,\text{light}\,\,\text{in}\,\,\text{air}}{\text{Velocity}\,\,\text{of}\,\,\text{light}\,\,\text{in}\,\,\text{medium}}\text{=}\sqrt{\text{2}}\] Velocity of light in medium \[=3\times {{10}^{8}}\times \frac{1}{\sqrt{2}}=2.12\times {{10}^{8}}m/\sec \]You need to login to perform this action.
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