On reflection from a mirror, which of the following characteristics of light remain constant?
O Speed
O Intensity
O Wavelength
O Frequency
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Answer is Frequency
If the time taken by light to enter the glass medium be less than the time taken by it to come out, then the number of waves being same and time shortened, so the frequency would be higher in glass medium. ... So, In any process, when time is unaffected, the frequency of the observed quantity remains same.
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