Geocentric Posted June 6, 2006 Report Posted June 6, 2006 With a fixed incident ray, if a plane mirror is rotated through an angle theta about an axis lying in the plane of incidence, what is the angle through which the reflected ray will rotate?I think the reflected ray will not rotate at all because the axis of rotation is perpendicular to the plane of the mirror. This means that mirror will be rotating in its own plane. Is my understanding right? Quote
Jay-qu Posted June 7, 2006 Report Posted June 7, 2006 axis of rotation is in the plane of incidence, this is the plane created by the incoming beam, you may want to check your reasoning :) Quote
Tim_Lou Posted June 7, 2006 Report Posted June 7, 2006 if you wanna dig deep, i think that photons hitting a rotating mirror will expereience some doppler's shift due to somethings about it's momentum.... well as for the question, it should obey the law:angle of incidence=angle of reflection Quote
Qfwfq Posted June 9, 2006 Report Posted June 9, 2006 It depends on which of the possible axes in the plane of incidence, and the answer would have to be worked out differentially. i think that photons hitting a rotating mirror will expereience some doppler's shiftWow, how about a quantitative analysis? Quote
ronthepon Posted June 9, 2006 Report Posted June 9, 2006 Angle of incidence = Angle of reflection. Rotate the mirrior by theta, the angle of incidence increases by theta. So does the angle of reflection. Hence the reflected ray rotates by two times theta. Quote
Qfwfq Posted June 9, 2006 Report Posted June 9, 2006 Not for an axis lying in the plane of incidence, Ron. Before replying, I read the first post again, a bit more carefully. ;) Quote
ronthepon Posted June 10, 2006 Report Posted June 10, 2006 Not for an axis lying in the plane of incidence, Ron. Before replying, I read the first post again, a bit more carefully. :eek:Oho! Oh, yeah. Oh yeah. He's right then... Sorry geocentric. Quote
Geocentric Posted June 12, 2006 Author Report Posted June 12, 2006 Oho! Oh, yeah. Oh yeah. He's right then... Sorry geocentric.Thats fine. Quote
Tim_Lou Posted June 13, 2006 Report Posted June 13, 2006 Wow, how about a quantitative analysis? thinking about how the rotation of the mirror affects space-time... hmmm, too complicated. actually i was thinking about something similar to compton's effect. the derivation should be similar. light reflected naturally obeys the equation described by compton. a photon that is 90 degrees incident to the mirror should experience a wavelength shift of 2*compton wavelength... perhaps i will try to work on it tomorrow. Quote
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