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A blue argon ion laser beam with power, P = 50 mW, and wavelength, λ =...

A blue argon ion laser beam with power, P = 50 mW, and wavelength, λ = 488 nm illuminates a white wall at a distance of 100 m. . The laser has a gaussian beam diameter of 700 µm at its output. The wall had a diffuse reflectivity of 0.1% per steradian.

a. What is the laser beam diameter on the wall?

b. What is the highest irradiance on the wall?

c. What is the radiance of the scattered light?

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