Physics 2000. Excellent interactive tutorials on interference and lasers.
Physics Applets. Many excellent applets on all topics by U. Wisconsin.
ExploreScience has excellent, simple, informative, interactive Shockwave experiments: sound beats, Doppler, interference, etc., prism, ray tracing.
Physlets. Useful Physics Applets from Davidson College: Doppler, impedance, ripple tank, Poisson, sound.
Optics for Children. Could be used for introduction at all levels.
Waves, sound, ray optics. Animations and interactive Shockwave animations by Glenbrook H. S. students.
Physics Simulations. Many simulations mirrored at Mississippi State.
The Wizard's Lab. A fun look at sound and light, including some movies.
101 Ways to Use a Laser, by Metrologic Instruments, Inc.
Jack's Page. Applets for first year college physics: matrix ray optics, FFSS, quantum string, coupled oscillators.
Color, Beats, Sound. Applets by the Little Shop of Physics at Colorado State.
Optics. These are very nice, even if you don't read Italian. Can adjust strength of colors. Nice ray diagrams for lenses and mirrors and you can move object. Total internal reflection. Laser (find under radiation).
65 nice applets for mechanics, waves, e&m, etc. but in Spanish.
The Physics Classroom. Tutorials, animated gifs, shockwave, questions done by students: guitar strings, reflected pulse, ray optics.
Optical Society of America. Links, meetings, help.
Rainbow. This excellent applet shows the physics of rainbow. You can change colors of light, the angle, etc. By Fu-Kwun Hwang.
Optics of the eye. This ShockWave applet illustrates the principle of accommodation in the eye. The user adjusts the distance between eye and object and sees the resulting ray diagram, the image size, and the lens shape.
Fermat Principle. This java applet let you visualize "the path of a ray of light that minimizes the travel time". ByFu-Kwun Hwang.
Reflection and refraction with a flashlight. This java applet illustrates the physics of a beam of light impinging on water/air surface. By Fu-Kwun Hwang.
Refraction experiment. Shine a light from a ray-box into a semicircular glass block and observe refraction and internal reflection, just like the traditional experiment.
Fish-eye view. Nice! Refraction and thus the image changes as you move the object. By Fu-Kwun Hwang.
Making a Pinhole Camera. Simple instructions for 126 film cartridges. By the Exploratorium.
How to Make and Use a Pinhole Camera. Simple instructions for 126 film cartridge.
Pinhole Photography - History, Images, Cameras, Formulas. More complete explanations.
Color mixing. This java applet let you mixing light beams or paint pigments, and find out the magic of color TV/computer screen. Can change intensity of each light. By Fu-Kwun Hwang.
Shadows and colors. This java applet let you play with shadows and 3 colored lights. By Fu-Kwun Hwang.
David's Whizzy Periodic Table. Click on an element, see moving electrons (different colors for different energy levels, see spectrum.
Transverse Waves. This ShockWave applet illustrates the concept of interference of transversal waves. The user can set the shape of two wave and watch the interference pattern. By Pascal Renault.
Waves: Doppler, Bragg diffraction, interference, etc. These are very nice, even if you don't read Italian.
Ripples in water. An applet showing and graphing interference through ripples in water. Can adjust the slit and frequency. By Santosh Pisharody.
Bragg's Law and Diffraction. Show atomic structure of crystals.
Tacoma Bridge Collapse. Various sites with great pics!
Wave Propagations. Movies of water waves, by a geologist.
Reflection and Refraction of Waves. The wavelets add to make a beam for reflection and refraction. You can change the substance, angle, and origination of waves. By Fu-Kwun Hwang.
Wave propagation. A VRML model of a flexible sheet can be disturbed using the mouse.
Phases of waves. Change the phase differences between waves, amplitude, frequency ratio, and direction. By Fu-Kwun Hwang.
Internet Webseum of Holography. Info, resources, questions about low-tech holograms.
Fresnel Diffraction patterns of (a) a straight-edge and (b) a single slit of variable width are displayed as intensity patterns; intensity plots; Cornu Spiral constructions.
Single Slit Diffraction. Change color and slit size; shows pattern and amplitude.
Computer Animations of Physical Processes. Combining colors of light, bending light in prisms, interference of two point sources, etc.
Optical Microscopy Primer - Physics of Light and Color. Many interactive animations on all aspects of light.
Science, Optics & You 16 activities and 10 inquires for projects. Most with interactive animations. From Florida State U.
Virtual Physics Laboratory at Northwestern U. Lenses, multi-slit interference - shows effect of single and multiple slits, Snell's Law, etc.
Location of airplane from its sound. Change speeds and watch the sound waves. By Fu-Kwun Hwang.
Make a sound wave. This java applet let you combine sine waves and hear the result. By Fu-Kwun Hwang.
Spectrum Analysis. Can add harmonics, see wave form, hear resulting sound. (Slow to load.)
The Soundry. Tutorial and interactive sound lab. Change frequency, hear it.
Beats. This applet allows you to see beats by changing the group velocity of a sine wave.
Palm Pipes. By Gene Easter and Bill Reitz - from Little Shop of Physics, Colorado State U.