Question

If refractive index of a medium is $1.5$, then velocity of light in that medium will be:

• A. $10×10^8$
• B. $2×10^8$
• C. $3×10^8$
• D. $4×10^8$

Answer 1

Answer: (B)

Refractive index $n=\frac{c}{v}$
$v=\frac{c}{n}=\frac{3×10^8}{1.5}$
$=2×10^{8}m/s$