The velocity of light in diamond, glass and water decreases in the following order:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Water > glass > diamond
V, velocity of light in a medium is inversely proportional to the refractive index, u.
$v=\frac{c}{u}⇒v∝\frac{1}{u}$
$u_{Diamond}>u_{Glass}>u_{Water}$
$∴ v_{Diamond}<v_{Glass}<v_{Water}$