give the ratios of velocities of light rays of wavelength of 4000A and 8000A in vaccum
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velocity is directly proportional to wavelength
so ratio will be,
v1/v2 = lamda1 / lamda2
4000/8000
2: 1 is ans
so ratio will be,
v1/v2 = lamda1 / lamda2
4000/8000
2: 1 is ans
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