IN a recent observation, F. K. Bauchwitz and D. Shoenberg have reported observing a new interference effect. With the eye accommodated for infinity, they observed coloured circular fringes when ...

IN the course of a class experiment demonstrating the circular Haidinger fringes produced by monochromatic illumination of a thin film between silvered surfaces, it was noticed that coloured circular ...

Optical interference is not only a fundamental phenomenon that has enabled new theories of light to be derived, but it has also been used in interferometry for the measurement of small displacements, ...