Question

the absolute refractive indices of two media A and B are 2.0 and 1.5 respectively if the speed of light in the medium b is 2 into 10 to the power 8 M per second calculate the speed of light in vacuum and medium A

Answer 1

$1.5 = sp \: in \: vacuum \div 2 \times {10}^{8}$
hence,
$3 \times {10}^{8} = speed \: of \: light \: in \: vacuum$
so
$2 = \: sp \: of \: light \: in \: that \: medium \div 3 \times {10}^{8}$
$6 \times {10}^{8} = sp \: in \: a$