Critical negative rake angle has a significant effect on roughness and residual stress of the machined surface. Yuan ZJ, Zhou M and Dong S. Effect of diamond tool sharpness on minimum cutting ...

However, if this would refract the ray at more than 90° from the normal, the refraction is not possible. As the angle of incidence in the glass is less than the critical angle, most of the light ...

This is called refraction. The frequency of light does ... Hz\) travels at a speed of \(1.24\times 10^{8}ms^{-1}\) in diamond. Calculate the refractive index of diamond for this colour of light.