Question

In the given figure,

$AB$ is an incident wavefront and $EC$ is refracted wavefront. Speed of light in medium $1$ is $v_1$ and speed of light in medium $2$ is $v_2$.
In case of refraction of a light beam, which of these remains constant?

• A. Speed
• B. Wavelength
• C. Frequency
• D. Intensity

Answer 1

Answer: (C)

In refraction, speed and wavelength changes but frequency remains constant. As part of light is always reflected (and also absorbed,) there is change in intensity of light also.