Disappearance Of Glass In Liquid
To demonstrate how index of refraction affects what we see in a fluid bath.
Glass seems to disappear when immersed in a liquid with the same index of refraction. The bottles, left to right,contain air, water, and two with microscope immersion oil, a liquid with almost the same index of refraction as glass. Bottles are available to pass around class.
Donald K. Day, A Safe Pyrex "Vanishing Solution," TPT 15, 438, (1977). Walter C. Connolly, and Thomas L. Rokoske, The Disappearing Dropper, TPT 18, 467, (1980).