Describes a computer simulation to elucidate the subject of coherence. The model on which simulation is based links coherence to the correlation of fields. It also describes the model and presents some results. (Author/GA)

Discusses how technological advancement, in particular: the explosion in useful wavelengths and the revolution in telescope design and fittings, multiplies astronomers' grasp of the cosmos. (HM)

Explains how to construct a three dimensional model for stereographic projection. It will be suitable for presenting the symmetry of crystal systems, and will help physics students understand the nature of crystallography. (GA)

Describes how the color of an object is related to its chemical structure. (CP)

Tested demonstrations on (a) color development through the formation of subtractive primary dyes and (b) fluidity of gases are presented. (CP)

Provides a description of the development, properties, and operation of laser beams. (CP)

In a certain sense the theory of the Maxwell fish-eye and that of the Kepler problem are formally equivalent. This equivalence and its consequences are described in some detail. (Author/GA)

Reviews current research being conducted to harness the energy of the sun. (SL)

Photographs and text describe techniques by which color negative film can be developed and printed. An equipment list, by which black and white printing facilities can be converted to make color prints, is provided. (CP)

Using the simple optical system and photodiode described in this article it is possible to give clear, quantitative demonstrations of all the Fraunhofer diffraction phenomena at single and multiple apertures. These measurements can be related to the theoretical predictions given in standard textbooks. Circuit diagram and optical layout are…

Refutes the Doppler effect as the explanation of large red shifts in the spectra of distant galaxies and explains the relativistic effects in which the light sources approach the observer obliquely. Provides several diagrams and graphs. (YP)

A television set, piece of aluminum foil, and meter stick can be used to estimate the speed of light within a few percentage points. The activity provides students with success and generates interest in physical optics. Steps in the experiment are outlined along with suggestions for obtaining accurate results. (DH)

Discusses how the sun's reflection from water offers a means for calculating sloped of waves. Experiments using angles of reflection from a tilted mirror are suggested and explained. A method of counterbalancing dominoes in a stack beyond the edge of a table (using Euler's constant) is also described. (DH)

Although polarimeters that illustrate rotation of plane-polarized light by chiral solutions have been previously described, the polarimeter described in this paper has certain advantages when used in conjunction with an overhead projector. Instructions for constructing this polarimeter and its use in demonstrating the optical activity of sugars…

Discussed is the need for examining the reasons for teaching optics to help to determine how optics should be taught. (SL)