CBSE-XI-Physics
17: Light Waves
- #5When light is refracted into a medium,
(a) its wavelength and frequency increase
(b) its wavelength increases but frequency remains unchanged
(c) its wavelength decreases but frequency remains unchanged
(d) its wavelength and frequency decreasedigAnsr: cAns : (c) its wavelength decreases but frequency remains unchanged
Frequency of a light wave, as it travels from one medium to another, always remains unchanged, while wavelength decreases.
Decrease in the wavelength of light entering a medium of refractive index `` \mu `` is given by
`` {\lambda }_{{\rm M}}=\frac{\lambda }{\mu },``
`` where{\lambda }_{{\rm M}}=wavelengthinmedium``
`` \lambda =wavelengthinvacuum``
`` \mu =refractiveindex``
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