31. However, the HRI camera does not have a diffraction grating to disperse the incoming reflected light. 32. Those diffraction grating holograms are an extraordinarily thin layer of metal over a paper or plastic backing. 33. If you are using the trellis as a diffraction grating then it wouldn't cancel the noise out. 34. To stabilize the lasing wavelength, a diffraction grating is etched close to the p-n junction of the diode. 35. Most optical discs exhibit a characteristic iridescence as a result of the diffraction grating formed by its grooves. 36. The light is then passed through a prism or diffraction grating to spread the light into a spectrum. 37. In this superb painting he simply let the intense color of Rowland's diffraction grating engulf the whole canvas. 38. *In optics, a diffraction grating is an optical component with a regular pattern, which diffracts light into several beams. 39. James Gregory discovered the diffraction grating by passing sunlight through a bird feather and observing the diffraction pattern produced. 40. In wavelength dispersive analysis, the fluorescent X-rays emitted by the material sample are directed into a diffraction grating monochromator.