Malus Law Calculator

Find the intensity of polarized light through a polarizer.

Transmitted intensity (W/m²) 75

Formula: I = I₀·cos²θ

Step-by-step with your numbers:

1. Values used:

2. Incident intensity = 100 W/m²

3. Angle between axes = 30 °

5. Transmitted intensity = 75W/m²

Did we solve your problem today?

Malus's law gives how much polarized light passes through a polarizer at an angle.

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).