A beam of light from a laser in a vacuum has a wavelength of 632.8nm and is incident on the surface of a glass slab. In the vacuum the beam make an angle of 32degrees witht the normal to the surface, while in the glass is makes an angle of 21.0degrees with the normal.
a)what is the index of refraction of the glass?
b)what is the wavelength of light in the glass?
The Attempt at a Solution
i know the wavelength is 632.8 so i tried subbing them into snells law and got
but the answer i got couldn't be right, its 243 and this could be the refractive index.