When a ray of light enters a glass slab, then
only the frequency changes
frequency and velocity change
frequency does not change
frequency and wavelength change
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2016
The speed of light ($v$), frequency ($f$), and wavelength ($\lambda$) are related by the equation $v = f\lambda$. When light enters a denser medium, its speed decreases. Since frequency ($f$) is constant, the wavelength ($\lambda = v/f$) must decrease proportionally.