1) "Smoke and Mirrors" (geometrical optics) Light (and bullets) travel in straight lines and reflect with equal angles to the perpendicular. Skit idea: use toy gun, cutout or posed figure to demonstrate path of a bullet. Maybe add a mirror to bounce the light (bullet) to another wall. Would have to be perfected beforehand! 2) "Black light" (optical flourescence) Use black light (really violet and UV) with special glasses that block the visible violet part. Anything that flouresces (stains, dried blood, special fingerprint powder) glows brightly. We'll need to get some dayglo paint. I can order one of these battery operated UV lights! http://shop.store.yahoo.com/flashlight/blacliguvarc.html To learn more, seach on <"black light" forensics>. 3) "Magnifying Glasses" (geometrical optics, lenses) focussing "strength" or "power" is measured in diopters. One diopeter = 1/focal length in meters. Focussing strengths of adjacent lenses combine, so focal length of two identical lenses is half of either one alone, and focal power is double. Skit idea: combine two magnifying glasses to see better. Cool web sites: http://www.houseof3d.com/pete/applets/lens/lens2.html http://sol.sci.uop.edu/~jfalward/lenses/magnfyingglass.jpg 4) "Night Vision" (infrared light) we have the night vision viewer ... skit idea: hide behind a dichroic screen that blocks IR rays. 5) Spectroscope ... analyze elements by the "fingerprint" of colors emitted. Detects atoms, not molecules. Could detect arsenic in hair samples (poison). 6) Is he dead? test. (Scattering of light in oxygenated tissue). See http://www.biomed.mtu.edu/osoykan/classes/be304/week6/week6.htm 7) Microscopy. Hair and fiber analysis, etc.