alleryThe refractive index of a medium is 1.5. The speed of light in that medium is (c = 3×10⁸ m/s)
A$4.5 \times 10^8$ m/s
B$3 \times 10^8$ m/s
C$2 \times 10^8$ m/s
D$1.5 \times 10^8$ m/s
Answer & Solution
Correct answer: C. $2 \times 10^8$ m/s
$n=c/v \Rightarrow v=c/n=(3\times10^8)/1.5=2\times10^8$ m/s.
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