Measure the thickness of your hair with a laser pointer

Unusual use of ordinary things

In this remarkable short video shows how to measure the thickness of a human hair pointer. In a three-minute video one scientist pulls the hair from the head of the other, and then shows how to measure its thickness. The hair used to be divided into two beam emitted by a laser pointer, and thus create a diffraction image. After measuring the distance between the light and dark areas of the diffraction pattern, and after measuring the distance from the hair to the wall, and measuring the wavelength of the laser, the scientists were able to calculate the diameter of a human hair using simple arithmetic operations of multiplication and division.

This method will help you figure out the diameter of any small object. You can, for example, to measure the diameter of hair from their relatives, or their pets.

via factroom.ru