is the speed of light in a material The bigger the refractive index, \(n\), the slower the light travels in that material - ie the smaller \(v_{2}\) is. Light of frequency \(4.6\times 10^{14} ...

A ray of blue light of frequency \(4.8 \times {10^{14}} Hz\) is incident on the surface of a piece of clear plastic as shown. For this light the refractive index of the plastic is \(1.48\).