Question

The speed of light in air is $3\times {10}^{8}m/s$. What will be its speed in diamond whose refractive index is $2.4$

• A. $3\times {10}^{8}m/s$
• B. $332m/s$
• C. $1.25\times {10}^{8}m/s$
• D. $7.2\times {10}^{8}m/s$

Answer 1

Answer: (C)

$1.25\times {10}^{8}m/s$

As we know,

$v=\frac{c}{\mu }=\frac{3\times {10}^8}{2.4}=1.25\times {10}^{8}m/s$