Question

4. The refractive index of a material is1.4. If the velocity of light in vacuum is
3x10^8 (10 raise to power 8)m/s. Find
the velocity of light in the material.
O
2.14x10*7 m/s
3.14x10^7 m/s
O 3.14x10 m/s
2.14x10^8 m/s​

Answer 1

Answer:

Let the velocity of light in medium be v.

$\to {\pink{\tt Refractive \:\: index =\frac{Velocity \:\: of \:\: light \:\: in \:\: vacuum }{Velocity \:\: of \:\: light \:\: in \:\: medium } }}$

$\tt \to 1.4=\frac{3 \times 10^8}{v}$

$\tt \to v=\frac{3 \times 10^8}{1.4}$

$\tt \to {\huge{ v=\frac{3 \times 10^8}{\frac{14}{10}}}}$

$\tt \to v=\frac{3 \times 10^9}{14}$

HOPE THIS HELPS :D