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, \[v=2\times {{10}^{14}}Hz\] \[\lambda =5000\,\,\overset{\text{o}}{\mathop{\text{A}}}\,=5000\times {{10}^{-10}}m\], \[c=3\times {{10}^{8}}m/s\] 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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