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Lab 5-Refraction

# Lab 5-Refraction - Introductory Optics System The Law of...

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Introductory Optics System II Experiment EQUIPMENT NEEDED: -Optics Bench -Ray Table and Base -Slit Plate -Cylindrical Lens. Slit Mask The Law of Refraction -Light Source -Component Holder -Slit Mask Angle of Incidence Slit Plate II Angle of Refraction Figure 4.1 Equipment Setup Introduction As you have seen, the direction of light propagation changes abruptly when light encounters a reflective surface. The direction also changes abruptly when light passes across a boundary between two different media of propagation, such as between air and acrylic, or between glass and water. In this case, the change of direction is called Refraction. As for reflection, a simple law characterizes the behavior of a refracted ray of light. According to the Law of Refraction, also known as Snell's Law: nl sin 81 = n2 sin 82 The quantities nl and n2 are constants, called indices of refraction, that depend on the two media through which the light is passing. The angles 8t and 82 are the angles that the ray of light makes with the nonnal to the boundary between the two media (see the inset in Figure 4.1).

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