FInd the value of speed of light below:
A medium has a refractive index of 4.2. Calculate the speed of light in the medium. (Speed of light in vacuum, \(c\ =\ 3\ \times\ 10^{8}\ m/s\))
Speed of light in the medium \(=\) \(\times\ 10^{8}\ m/s\)
[Note: Enter the answer upto two decimal places.]