Question

When a light ray enters from oil to glass on oil glass interface. Velocity of light changes by a factor of: $\left(\mu_{oil}=2,\,\mu_{glass}=\frac{3}{2}\right)$

• A. $\frac{4}{3}$
• B. $\frac{1}{2}$
• C. 3
• D. 1

Answer 1

Answer: (A)

$\frac{4}{3}$

Answer 2

If a light ray travels from oil to glass then,
$\Rightarrow\, \frac{\mu_{oil}}{\mu_{glass}}=\frac{V_{glass}}{V_{oil}}$
$\Rightarrow\, \frac{2}{3}\times2 = \frac{V_{glass}}{V_{oil}}=\frac{4}{3}$
Then velocity of light in glass is $\frac{4}{3}$ of velocity in oil.
So the correct option is (A): $\frac{4}{3}$.