Question

light enters from air into a glass plate having refractive index 1.50 . What is the speed of light in glass? ( the speed of light in vacuum is
$3 \times 10 {}^{8} \: metre \: per \: second )$

Answer 1

$2 \times {10}^{8} m \: {s}^{ - 1}$
because refractive index= Speed in vaccum/ Speed in medium

I hope it helps

Answer 2

2×10^8 is the answer