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A ray of light travelling in air have wa...

A ray of light travelling in air have wavelength `lambda`,frequency v,velocity u and intensity I.If this ray enters into water,then these parameters are `lambda',v',u'` and `I'` respectively.which of the following relation is correct?

A

`lambda=lambda'`

B

`v=v'`

C

`u=u'`

D

`I=I'`.

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