Eisco Labs Educational Diffraction Slide

For demonstrating the principle of the diffraction grating and the way in which its properties are dependent upon the number of lines per unit length. Comprises a card mount 90 x 40 mm approximately with three 16 x 9 mm apertures, each containing a diffraction grating replica. The grating are of 100 lines / mm, 300 lines / mm and 600 lines /mm respectively and protected cover glasses.