Which of these travels in glass with minimum velocity? (1) red light (2) violet light (3) green light (4) yellow light

Which of these travels in glass with minimum velocity? (1) red light (2) violet light (3) green light (4) yellow light
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(2) violet light Explanation: Red light has a longer wavelength than violet light and the other colours of visible light have intermediate wavelengths. As light passes from air into glass, there is reduction of velocity. Due to longer wave-lengths, red waves travel fastest and is refracted the least, while violet waves travel the slowest and is refracted the most.
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