A diffraction grating is a scientific tool that is used to separate light into its different wavelengths. It consists of a large number of equally spaced parallel slits or grooves that are etched onto a surface.
"Slits per cm" is a measure of the density of the slits on a diffraction grating. It refers to the number of slits that are present in one centimeter of the grating's surface.
The number of slits per cm on a diffraction grating directly affects the spacing of the diffraction pattern. The smaller the spacing between the slits, the wider the diffraction pattern will be.
The number of slits per cm on a diffraction grating is directly proportional to the wavelength of light. This means that as the number of slits per cm increases, the wavelength of light also increases.
The number of slits per cm on a diffraction grating can be calculated by dividing the total number of slits on the grating by the width of the grating in centimeters. For example, if a grating has 5000 slits and a width of 2 cm, the number of slits per cm would be 2500.