Demo diffraction

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With a helium-neon laser, we can demonstrate the diffraction of light from a single slit, double slit pattern or from gratings and surfaces of CD's. The single and double slits are constructed from breaking apart a razor blade and connecting the broken halves back to back. For the double slit a common pin is inserted inside the gap. The obtained diffraction images can also be analyzed using the famous ImageJ software.

These demonstrations bring home useful concepts of interference, diffraction and the wave nature of electromagnetic radiation.

Images of single and double sit patterns.
Images of single and double sit patterns.
Diffraction pattern of a piece of hair.
Diffraction pattern of a piece of hair.
Profile plot of fringes from a single slit
Profile plot of fringes from a single slit
Diffraction pattern from the surface of a CD.
Diffraction pattern from the surface of a CD.
Demonstrating diffraction.
Demonstrating diffraction.
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