If the speed of light in air is $3 \times 10^8$ m/s, then the speed of light in a medium of refractive index $\frac{3}{2}$ is
$2 imes 10^8$ m/s
$ rac{9}{4} imes 10^8$ m/s
$ rac{3}{2} imes 10^8$ m/s
$3 imes 10^8$ m/s
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CDS-1 – 2020
$v = (3 \times 10^8 \, \text{m/s}) / (3/2) = (3 \times 10^8 \, \text{m/s}) \times (2/3) = 2 \times 10^8$ m/s.
– $c$ is the speed of light in vacuum (or air).
– $v$ is the speed of light in the medium.