aser bean has a power of 50mW. It has an aperture of 5x10- nd it emits light of wavelength 7200A°. The beam is ed with lens of focal length 0.1m. Calculate the area and sity of the image
aser bean has a power of 50mW. It has an aperture of 5x10- nd it emits light of wavelength 7200A°. The beam is ed with lens of focal length 0.1m. Calculate the area and sity of the image
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