This film demonstrates the measurement of the speed of light in both air and water using experimental setups. The first ...

It is refraction that makes some objects appear to bend when they are viewed through water, like the straw shown here. If the light hits the surface of a glass block at an angle, this change in ...

In the image, there is a paper behind the glass that shows two arrows. The readers are challenged to find the direction in which the arrows point—and they have to do it in 10 seconds. So do you want ...

Refraction occurs when light changes direction as it passes, e.g., from air into water or glass. Negative refraction, however, is a counterintuitive effect where light in a medium bends in the ...