A laser emits a narrow beam of light the radius of the beam
A laser emits a narrow beam of light. The radius of the beam is 3.5 mm, and the power is 2.5 mW. What is the intensity of the laser beam?
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a ray in air is incident on a glass plate whose index of refraction is 168 determine the angle of refraction is
a laser emits a narrow beam of light the radius of the beam is 35 mm and the power is 25 mw what is the intensity of
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the index of refraction of the core of a piece of fibber optic cable is 172 if the index of the surrounding cladding is
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