Q3:- A laser has a divergence of 0.2 milliradians (mrad): (i) If the beam cross section is circular, what is the solid angle of the beam? (ii) What fraction of 4r steradians does this solid angle represent? (iii) If the power of the beam is 5 mW, what is the intensity of a point at 2 m distance from the laser?
Q3:- A laser has a divergence of 0.2 milliradians (mrad): (i) If the beam cross section is circular, what is the solid angle of the beam? (ii) What fraction of 4r steradians does this solid angle represent? (iii) If the power of the beam is 5 mW, what is the intensity of a point at 2 m distance from the laser?
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