Answer to Question #333214 in Optics for Akash

Question #333214

With the help of appropriate energy level diagram, explain the working of a He-Ne laser. A He-Ne laser emits a beam of diameter 2103m and wavelength 630 nm. It is directed towards an aeroplane flying at a height of 11 km. Calculate the diameter of the light patch produced on the surface of the aeroplan

Expert's answer

"D=H\\sin\\theta=1.22H\\cdot \\frac \\lambda d=4 .23~m ."

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