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Simple Laser Diffraction Experiment at Home: Long story short: You will learn how to observe interference patterns at home (using the cheapest laser point you got). I will also teach you how to use your laser to measure tiny objects, like the width of your hair!!
For instance, the following are some real-life examples of diffraction: 1. Compact Disk. 2. Hologram. 3. Light entering a dark room. 4. Crepuscular Rays. 5. X-Ray Diffraction. 6. Water passing from a small gap. 7. Solar/Lunar Corona. 8. Sound. 9. Ring of light around the source. 10. Signal Propagation. 1.
Shine it at a couple of closely-spaced double slits and project the diffraction pattern onto a distant screen. Make some measurements and use Young's Equation to determine the wavelength of light. Repeat your measurements and calculations for all three lasers and check your answers.
Experiment with diffraction through elliptical, rectangular, or irregular apertures. Make waves with a dripping faucet, audio speaker, or laser! Add a second source to create an interference pattern.
You can easily demonstrate diffraction using a candle or a small bright flashlight bulb and a slit made with two pencils. The diffraction pattern—the pattern of dark and light created when light bends around an edge or edges—shows that light has wavelike properties.
Diffraction is most noticeable when the obstacle is similar in size to the wavelength of the light. When light waves diffract around obstacles, they overlap each other. This overlap results in constructive and destructive interference at different locations, producing an interference pattern.
Help students to make the link between colour and wavelength. Finer gratings will spread the light more. For a diffraction grating d sin A = n (wavelength), where A = angle at which the light appears, n is the diffraction order (1,2, ...), = wavelength, d = spacing between slits.
