Physics

Malus Law Calculator

Find the intensity of polarized light through a polarizer.

Calculated Output

Transmitted intensity (W/m²) 75

Formula: I = I₀·cos²θ

Step-by-Step Breakdown

1. Values used:

2. Incident intensity = 100 W/m²

3. Angle between axes = 30 °

5. Transmitted intensity = 75W/m²

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The math behind it

I = I₀·cos²θ, where θ is the angle between the light's polarization and the polarizer axis.

100 W/m² at 30° → 75 W/m².

What happens at 90°?

cos²90° = 0, so no light gets through (crossed polarizers).