Question

Denser medium have more
$\left( A \right)$ Velocity of light
$\left( B \right)$ Refractive index
$\left( C \right)$ Both
$\left( D \right)$ All

Answer 1

Hint: Use the concept that refractive index is different for different mediums, and velocity of light is inversely proportional to refractive index so use these properties to reach the solution of the question.
Formula used – $V = \dfrac{C}{\eta }$

Complete Step-by-Step solution:
As we know that refractive index is not the same for different mediums it is different.
For example: refractive index of air = 1.
And refractive index of glass slab = 1.5.
Mow as we know that velocity of light (V) is inversely proportional to refractive index ($\eta $), where proportionality constant is speed of light (C)
$ \Rightarrow V = \dfrac{C}{\eta }$
So if the refractive index increases the velocity of light decreases.
Now from the above example glass slab is a denser medium as compared to air so its refractive index is higher than air.
So the velocity of light in glass slab is less than the velocity of light in air.
So denser mediums have higher refractive index but lower velocity of light.
So this is the required answer.
Hence option (B) is the correct answer.

Note – Whenever we face such types of questions always remember that velocity of light always depends upon the refractive index and the formula of dependency is stated above so on the basis of the above formula higher refractive index has lower velocity of light.