Laser pointers and compact discs (CDs) have been used since the 1990s for simple optics demonstrations.1–5 The use of a laser pointer, a glass of water with a few drops of milk, and a mirror allow us to show the phenomena of reflection, refraction, and total internal reflection of light, while the use of a laser pointer and a CD allows us to show the phenomenon of diffraction. In this work we describe a simple and cheap experiment in which the four previous optics phenomena can be visualized at the same time. The experiment makes use of a green laser pointer (typical wavelength of 532 nm), a support for the laser, a CD (700 MB of data capacity), a glass tank with a rectangular prism shape (31 cm long, 14 cm high, and 7 cm wide, that can be closed at the top with a glass lid), water, rhodamine...

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