A) \[6\times {{10}^{8}}m/s\]
B) \[3\times {{10}^{8}}m/s\]
C) \[2\times {{10}^{8}}m/s\]
D) \[1.5\times {{10}^{8}}m/s\]
Correct Answer: D
Solution :
Critical angle \[C=30{}^\circ \] Refractive in dexroman \[\mu =\frac{1}{\sin C}=\frac{1}{\sin 30{}^\circ }=2\] \[\therefore \] Also \[\mu =\frac{c}{\upsilon }\] \[\therefore \] speed of light in medium \[\upsilon =\frac{c}{\mu }=\frac{3\times {{10}^{8}}}{2}\] \[=1.5\times {{10}^{8}}m/s\]
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