Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
A light of wavelength 6000 A in air enters a medium of refractive index 1.5. Inside the medium, its frequency is v and its wavelength is\[\lambda \] (1)\[v=5\times {{10}^{14}}Hz\] (2)\[v=7.5\times {{10}^{14}}Hz\] (3) \[\lambda =4000{\AA}\] (4) \[\lambda =9000{\AA}\]A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: D
Solution :
\[{{\lambda }_{a}}=6000{\AA}\] \[{{v}_{a}}=\frac{c}{{{\lambda }_{a}}}=\frac{3\times {{10}^{8}}}{6000\times {{10}^{-10}}}\] \[=5\times {{10}^{14}}Hz\] In water, \[{{\lambda }_{m}}=\frac{{{\lambda }_{a}}}{\mu }=\frac{6000}{1.5}=4000{\AA}\]
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