Using light to find the average thickness of the human hair!

Ah, physics. Long time no see!

In this second post for my portfolio I present you an investigation I made on finding the width of a hair using single-slit diffraction in
accordance with Babinet’s principle.

By pointing a laser onto a hair, the light projected onto a flat surface behind it will show an interference pattern, created by the diffraction of light around the hair. The phenomena isn’t single slit diffraction, it is the inverse of single slit diffraction, in accordance with Babinet’s principle.

“The diffraction pattern from an opaque body is identical to that from a hole of the same size and shape except for the overall forward beam intensity” – Jacques Babinet

If you are interested in giving the experiment a read through, click here

Grade: 7/7, 12 pages incl. MLA citations and bibliography

 

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