Explains the use of a convex lens as a thick mirror. Shows the expression for the power of this type mirror. (YP)

Discusses how the caustic by reflection is formed. Indicates that the phenomenon can be demonstrated by showing the reflection of the light from a distant point source from the inner curve of a polished hoop of metal (such as a wedding ring). (JN)

Describes three demonstrations used in the Chicago Museum of Science and Industry polarized light show. The procedures employed are suitable for the classroom by using smaller polarizers and an overhead projector. Topic areas include properties of cellophane tape, nondisappearing arrows, and rope through a picket fence. (JN)

Presents a nonmathematical approach to help students understand that there are two types of coherence and to associate coherence as a property of the illumination at an object itself. The approach also lends itself to an introduction to the Fourier approach for analyzing imaging systems. (JN)

Describes the construction of simple microwave sources of centimeter wavelength with bulk-effect diodes, and accessory equipment for experiments and demonstrations in physical optics. (MLH)

Presented are justifications for including optics in the science curriculum, an outline of optics instruction as presently presented in English secondary schools, and a review of probable future trends in optics instruction. (SL)

Discusses the theory and experimental procedures for using Young's eriometer to determine the diameters of blood corpuscles, lycopodium powder, and wool fibers. (CC)

Presents theoretical fundamentals of the experiment on the multiple reflection of helium-neon laser beams from a black-surfaced mirror. Further applications to student projects are indicated. (CC)

Discusses the nature of virtual images and how they can be plotted and used to reveal important relationships between objects and their mirror reflections. Describes some applications of virtual images in the theater and classroom. (JR)

A study done for the National Medical Audio Visual Center on projection systems, covering all aspects which must be properly planned for the most effective results in communications systems. (Author)

An experiment in which both Raman-Nath and Bragg diffraction of light by acoustic waves in water are observed in the sound frequency range from 5 to 45 MHz. The apparatus consists of a laser, light detector, rf power source, quartz transducer, and homemade water cell. (Author/DF)