wavelength, frequency, velocity and inte...

wavelength, frequency, velocity and intensity of light when travelling in air is `lambda, nu, v` and I respectively, When the light ray enters water the value of the above mentioned properties become `lambda_(1),nu_(1),v and I_(1)` respectively. Which relation is correct?

`lambda = lambda_(1)`

`nu = nu_(1)`

`v = v_(1)`

`I = I_(1)`

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