1.5 x 108m-1
2.0 x 108m-1
3.0 x 108m-1
4.5 x 108m-1
9.0 x 108m-1
Correct answer is B
n = \(\frac{\text{speed in air}}{\text{speed in glass}}\) 1.5 = \(\frac{3\times10^4}{\text{speed in glass}}\) speed in glass = 2 x 108ms-1
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