A) 1.40
B) 1.50
C) 3.00
D) 1.33
Correct Answer: C
Solution :
Velocity of light waves in material is \[v-v\lambda \] ....(i) Refractive index of material is \[\mu =\frac{c}{v}\] ?(ii) where c is speed of light in vacuum or air. or \[\mu =\frac{c}{v\lambda }\] ...(iii) Given, \[v=2\times {{10}^{14}}\,Hz,\] \[\lambda =5000\,{\AA}=5000\,\times {{10}^{-10}}\,m,\] \[c=3\times {{10}^{8}}\,m/s\] Hence, from Eq. (iii), we get \[\mu =\frac{3\times {{10}^{8}}}{2\times {{10}^{14}}\times 5000\times {{10}^{-10}}}\,=3.00\]
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