Question

When light is refracted, which of the following does not change?

• A. Frequency
• B. Velocity
• C. Wavelength
• D. Amplitude

Answer 1

The correct option is A Frequency

$1.)$ When the ray of light passes from one medium to the other medium, there is absorption of some energy of the light ray and hence, the amplitude of the light ray changes.

$2.)$ We know that the velocity of the light decreases when the light moves from rarer to denser medium.

$V_{\text{rarer}}>V_{\text{denser}}$

$[\because V=\lambda f]$

${\lambda }_{\text{rarer}}{f}_{\text{rarer}}>{\lambda }_{\text{denser}}{f}_{\text{denser}}$

Hence, Wavelength and speed varies with respect to medium.

$3.)$ Frequency does not change when light is refracted because it only depends on the source of wave.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(\text{B}\right)$ is the correct answer.