Science, Maths & Technology
Measure the Pulfrich Effect
...changed into an elliptical swing. In other words, the pendulum should appear to be tracing an oval path. This will still work perfectly well if you wear spectacles – just hold the sunglasses in front of one lens. However, if your spectacles are of the photochromic variety that change shade according to the amount of light falling on them, holding the sunglassesi n front...