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# When a light ray enters in a glass slab from air then: A) Its wavelength increases.B) Its wavelength decreases.C) Its frequency increases.D) Neither wavelength or frequency changes.

Last updated date: 12th Sep 2024
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Hint: As we know, when a light enters into a glass slab it bends towards the normal this phenomena is commonly called refraction. We know that refraction is due to the change in wavelength due to change in speed of light in other medium while frequency is inherent property of a light ray.

Complete step by step solution:We know that glass is denser medium than air. Glass has a higher refractive index than air. So the speed of light in air is greater than the speed of light in glass. Because the relation between refractive index of glass and speed of light is
$v=\dfrac{c}{\mu }$, Where, $v$ is the speed of light at any medium, $\mu$ is the refractive index of that medium, and $c$ is the speed of light in vacuum. So, due to the higher refractive index of glass the speed of light in glass is slow.
And there is also a relation between speed of light in that medium, wavelength and frequency.
i.e. $v=f\lambda$
Where, $f$ is the frequency of light ray it is inherent property and this doesn’t change with change with medium, and $\lambda$ is wavelength of light in that medium.
So, if the speed of light decreases with change in medium then wavelength of light decreases because the frequency of light is constant.

Hence, option(B) is correct.