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A helium-neon laser (the low power red laser often used as a pointer in presentations) is...

A helium-neon laser (the low power red laser often used as a pointer in presentations) is rated at 0.15mW. If the image of the laser is a circle of 0.25 cm in diameter, and the wavelength is 632 nm in air:

a.) Compute the intensity of light. You may assume no power loss before it makes the circular image.

b.) Calculate the rms electric field magnitude of the light.

c.) Calculate the frequency of the light.

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