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When a ray of light enters a glass slab from air (a) its wavelength decreases (b) its wavelength increases (c) its frequency increases (d) neither its wavelength nor its frequency changes |
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Answer» (a) its wavelength decreases Wavelength, λ = \(\frac{velocity}{frequency}\) = \(\frac{u}{v}\) When light travels from air to glass, frequency ν remains unchanged, velocity u decreases and hence wave length λ also decreses |
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