Question

Speed of light with the increase in its wavelength when it travel in a given medium.

• A. increases
• B. decreases
• C. remain constant

Answer 1

The correct option is A increases

From the relation
$c=f\lambda$
where, $c$ is the speed of light, $f$ is the frequency and $\lambda$ is the wavelength.
We know that frequency of light is constant, irrespective of the medium.
So, from the above relation we can say that, the speed of light is proportional to wavelegth used. Hence, it increases with the increase in its wavelength when it travel in a given medium.