Today, students had two tasks:
- determine the wavelength of the laser
- determine the width of a human hair
The results were excellent. One group calculated a wavelength of 900 nm, but realized that wasn’t a reasonable value of the Helium-Neon red laser. Last year, I had students just measure the wavelength of the laser. This year, I added measuring the width of a human hair which emphasized what a precision instrument light can be.