Malus's Law Calculator

Calculate the transmitted intensity of perfectly polarized light after it passes through a polarizing filter. Based on Malus's Law (I = I₀ * cos²θ).

Malus's Law Calculator

Can be in W/m² or as a percentage (e.g., 100).
Angle between the light's initial polarization and the polarizer's axis.

How to Use

  1. 1

    Enter Initial Intensity

    Input the initial intensity (I₀) of the polarized light. You can use any unit (like W/m²) or just use 100 for a percentage.

  2. 2

    Enter Angle

    Input the angle (θ) in degrees between the light's initial polarization direction and the axis of the polarizer.

  3. 3

    Calculate

    Click calculate to find the final intensity (I) of the light that successfully transmits through the filter.

Frequently Asked Questions

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