Poly methyl methacrylate pmma also known as acrylic acrylic glass or plexiglass as well as by the trade names crylux plexiglas acrylite astariglas lucite perclax and perspex among several others see below is a transparent thermoplastic often used in sheet form as a lightweight or shatter resistant alternative to glass the same material can be used as a casting resin or in inks.
Refractive index of plastic sheet.
Conditions spec sheet n absolute.
Conditions spec sheet n absolute.
The refracted beam in sheet 2 makes an angle of 31 7 with the normal.
Standard refractive index measurements are taken at the yellow doublet sodium d line with a wavelength of 589 nanometers.
Three sheets of plastic have unknown indices of refraction.
Many materials have a well characterized refractive index but these indexes depend strongly upon the frequency of light.
Dispersion properties of optical polymers acta physica polonica a 116 585 587 2009 fit of the experimental data with the sellmeier dispersion formula.
There are also weaker dependencies on temperature pressure stress etc as well on precise material compositions presence of dopants etc.
Conditions spec sheet n absolute.