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.
When a ray of light enters a glass slab, then
Asked in UPSC NDA 2 2016 · Topic: Optics (Reflection and Refraction at plane and spherical surfaces)
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