Problem: The wavelength of red helium-neon laser light in air is 632.8 nm.What is its speed in glass that has an index of refraction of 1.48?

FREE Expert Solution

Refractive index is given by:

$\overline{){\mathbf{\eta }}{\mathbf{=}}\frac{\mathbf{c}}{\mathbf{v}}}$

The speed of light in air very close to the speed of light in vacuum.

Problem Details

The wavelength of red helium-neon laser light in air is 632.8 nm.

What is its speed in glass that has an index of refraction of 1.48?