A laser painter has a power of 10 mw and its beam is focused to a circle with a diameter of 0.168 mm.
Part(a): What is the intensity of the laser beam at the focal point?
Part (b): What is RMS value of the electric field at the focal point?
Part (c): What is the RMS value of the magnetic field at the focal point?
(4) A light beam in air enters a piece of glass at an angle of 41 angle and refracts to an angle of 33 degrees.
Part (a): Wht is the index of refraction of the glass?
Part (b): What is the angle of the reflected beam?
Part (c): What is the critical angle for light travelling inside the glass?
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