The Secret to Soap Bubbles' Iridescent Rainbows

The Secret to Soap Bubbles' Iridescent Rainbows

When it comes to reflected light, you get a half wavelength phase shift if it reflects off a material with a higher index of refraction. As the film thickness changes, different wavelengths of light achieve constructive interference.

Physics Owes a Lot to a Little-Loved Math Class

Physics Owes a Lot to a Little-Loved Math Class

I will use all of the triangles in the drawing above and measure both x and y (although x doesn't change) and then plot the ratio of y/x versus the angle theta.

Galileo, Krypton, and How the True and Accurate Meter Came to Be

Galileo, Krypton, and How the True and Accurate Meter Came to Be

By way of Galileo’s simple observation so length and time were seen to be linked—a linkage that made it possible that a length could be derived not simply from the dimensions of limbs and knuckles and strides, but by the hitherto quite unanticipated observation of the passage of time.From the book The Perfectionists: How Precision Engineers Created the Modern World by Simon Winchester.HarperA century later an English divine, John Wilkins, proposed employing Galileo’s discovery to create an entirely new fundamental unit, one that had nothing to do with the then-traditional standard in England, which was a rod that was more or less officially declared to be the length of a yard.