Malus Law Apparatus

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Model No: HO-ED-P-02

In this experiment, Malus law of polarization is verified by showing that the intensity of light passed through two polarizers depends on the square of the cosine of the angle between the two polarization axes. Laser light is used in this experiment because its wavelength is almost completely extinguished by the crossed polarizers. Optical rail and carriages are used for assembling the components. All components are made out of anodized aluminium and stainless steel for corrosion free life. This experiment verifies Malus law. Mathematically, as per the law the measured intensity, Φ, is given by:
Φ = Φ₀ (COS θ_A-P)²
where Φ₀ is the measured intensity without the analyzer and θ_A-P is the difference between the second polarizer (called the analyzer) and the first polarizer (called the polarizer).

► Determine the plane of polarization of a laser beam

► Tabulate the intensity of light transmitted by the polarization filter as a function of angular position of the polarizer

► Verification of Malus Law

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Components Included

• Optical rail
• Diode laser with power supply
• Kinematic laser mount with rail carriage
• Polarizer with rail carriage
• Analyzer with rail carriage
• Pinhole photodetector
• Detector O/P measurement unit

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