The polarization of a helium-neon laser can change with time. The light from a 1

Question

The polarization of a helium-neon laser can change with time. The light from a 1.5 mW laser is initially horizontally polarized; as the laser warms up, the light changes to be vertically polarized. Suppose the laser beam passes through a polarizer whose axis is 22 from horizontal.

Part A

By what percent does the light intensity transmitted through the polarizer decrease as the laser warms up

The polarization of a helium-neon laser can change with time. The light from a 1.5 mW laser is initially horizontally polarized; as the laser warms up, the light changes to be vertically polarized. Suppose the laser beam passes through a polarizer whose axis is 22 from horizontal.

Part A

By what percent does the light intensity transmitted through the polarizer decrease as the laser warms up

Explanation / Answer

Intensity of light transmitted through polariser,

I = Io*cos^2(theta)

I = Io*cos^2(90 - 22)

I = Io*0.14

I/Io = 0.14

I/Io = 14% <<<<<<<<<---------------Answer

14% of light intensity is transmitted.

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