Question

The absolute refractive indices of glass and water are 3/2 and 4/3 respectively.
If the speed of light in glass is 2 x 10^8 m/s, then calculate the speed of light in
(i) vacuum,
(ii) water
​

Answer 1

Explanation:

0

$\frac{4}{3} = \frac{speed \: of \: vaccum}{ {2 \times 10}^{8} }$

$4 \times 2 { \times 10}^{8} \div 3 \times speed \: \: vccum \: \:$

speed of vacuum =

${8 \times 10}^{8} \div 3$

${2.6 \times 10}^{8}$

speed of water

$\frac{3}{2} = \frac{speed \: of \: water} {2 \times 10}^{8}$

${6 \times 10}^{8} \div 2 = {3 \times 10}^{8}$