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  4. In the given figure, <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/be333da4efa51f3dabf39cd69658733e-.png /> A B is an incident wavefront and E C is refracted wavefront. Speed of light in medium 1 is v1 and speed of light in medium 2 is v2. In case of refraction of a light beam, which of these remains constant?

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Q. In the given figure,
image
$A B$ is an incident wavefront and $E C$ 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?

Wave Optics

Solution:

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.