A ray of light enters into a glass slab of refractive index μ from air. If c is the speed of light in air, then the speed of light in glass slab is
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When a ray of light enters a glass slab from air then its speed decreases as it encounters a dense medium. Since to conserve energy (which is dependent solely on frequency), the frequency must remain constant, the wavelength of light changes. Wavelength is decreased by a factor called refractive index of the medium.
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