Question

How does the speed of light in glass change on increasing the wavelength of light?

• A. Increases
• B. Decreases
• C. Remains constant
• D. Data insufficient

Answer 1

The correct option is A Increases

Light being an electromagnetic wave, the velocity is given as v= $f\lambda$ where $f$ is the frequency and $\lambda$ is the wavelength.
Thus, velocity and wavelength are directly proportional and speed of light increases with increase in wavelength and frequency doesn't change upon passing through a medium.