$A$ ray of light travelling in air has wavelength $\lambda$,frequency $n$,velocity $v$,and intensity $I$. If this ray enters into water,then these parameters are $\lambda'$,$n'$,$v'$,and $I'$ respectively. Which relation is correct from the following?
- A$\lambda = \lambda'$
- B$n = n'$
- C$v = v'$
- D$I = I'$
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