A simple analog computer program is described which, in conjunction with a dual-trace storage oscilloscope, can demonstrate travelling and standing waves, the effect of various reflection coefficients, standing wave ratios, and other wave phenomena. (Author/CP)

Describes three simple experiments using Fermat's principle; a single reflection, Schwarz's triangle problem, and light triangle inscribed inside a circle. (GA)

Teachers may introduce students to anamorphic art (images designed to be looked at with conical mirrors or with mirrors diagonal to the image) with inexpensive cylindrical mirrors. By using polar graph paper, images can be made "correctly distorted" and will appear normal when viewed with a cylindrical mirror. (DH)

Presents an apparatus, a solid-state sound generator in a plastic ball. Includes pictures of the ball and a diagram of the piezo horn. (YP)

Discusses employment opportunities in optical engineering. States that demand is expanding faster than the supply of degree holders in the field. Points out that graduates from other fields are being used to fill the demand. Identifies programs that offer degrees in optical engineering. (CW)

Describes a computer program which calculates a best estimate of refractive index and dispersion from a large number of observations using the double variation method of measuring refractive index along with Sellmeier constants of the immersion oils. Program listing with examples will be provided on written request to the author. (Author/JM)

A simple device used to demonstrate the main features of primary color addition is described. Materials needed to construct the device, procedures used, and typical results are discussed. (JN)

Described is a technique for utilizing television video equipment to display diffraction and interference phenomena for elementary physics courses. (SL)

Describes ray tracing techniques and the method of virtual mirrors to locate images when using multiple mirrors. (JN)

Examines the nature of laser light. Topics include: (1) production and characteristics of laser light; (2) nine types of lasers; (3) five laser techniques including holography; (4) laser spectroscopy; and (5) laser fusion and other applications. (SK)

Electronic energy levels in noble gas atoms may be determined with a simple teaching apparatus incorporating a resonance potentials tube in which the electron beam intensity is held constant. The resulting spectra are little inferior to those obtained by more elaborate electron-impact methods and complement optical emission spectra. (Author/SK)

Describes an undergraduate experiment which uses derivative spectroscopy to investigate the validity of the Planck function appearing in the blackbody radiation law. These measurements allow a critical examination of this function and also serve as an introduction to derivative spectroscopy techniques. (Author/HM)

Presents two methods for measuring the index of refraction of glass or lucite. These two methods, used in the freshman laboratory, are based on the fact that a ray of light inside a block will be refracted parallel to the surface. (HM)

Discusses a laboratory experiment, using the single-photon counting technique, to determine the fluorescence spectrum of NaI(T1) crystal under gamma excitation. (Author/GA)

Presents a discussion for the principles of a Fourier Transform infrared spectrophotometer which is intended to provide chemists with a basic understanding of these principles. (HM)