Question

An optical medium has refractive index $2.0$. The value of speed of light in that medium is approximately equal to

• A. $6 \times 10^{8} \,ms ^{-1}$
• B. $1.5 \times 10^{8} \,ms ^{-1}$
• C. $1.5 \times 10^{-8} \,ms ^{-1}$
• D. $3 \times 10^{8}\, ms ^{-1}$

Answer 1

Answer: (C)

$n _{1} v _{1}= n _{2}\, v _{2} $
$1 \times 3 \times 10^{8}=2 \times V _{2}$