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ICSE Class 10 Answered

How does the  speed of light in glass change on increasing the wavelength of light? 
Asked by jaiswalsindhuli717 | 12 Sep, 2018, 07:00: PM
answered-by-expert Expert Answer
Speed of light C is related to frequency ν and wavelength λ that is given by,     c = ν λ ..................(1)
 
when we have light of given wavelength in air,  its frequency is fixed as given by eqn.(1).
When this light enters glass, frquency will not change but its speed will decrease since glass is optically denser medium compare to air.
when speed of light decreases, correspondingly its wavelength decreases because frequency is constant.
Answered by Thiyagarajan K | 14 Sep, 2018, 02:25: PM

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