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absorption amplitude analyser angle of incidence aperture axes beam bright centre circle colours components consequently corresponding cos2 crystal curvature curve dark bands determined deviation diffraction direction displacement distance diverging doubly refracting effect electric emerging emission theory energy equal equation ether experiment film Fresnel's fringes glass half-period elements Hence illumination incident light increases intensity interference lens Lord Rayleigh luminous magnetic maximum medium molecules motion Nicol observed optic axis ordinary ordinary ray parallel passes pencil perpendicular phase placed plane of incidence plane of polarisation plane wave plane-polarised light polarised light position principal plane prism produced quartz radius rays reflected light reflected wave refractive index resultant retardation revolving mirror right angles rings rotation screen sin2 slit spectrum speed spherical substance telescope theory thickness tion transmitted traversed velocity of light velocity of propagation vibration violet wave front wave length wave surface width zero
Page 20 - Those that are averse from assenting to any new discoveries but such as they can explain by an hypothesis may for the present suppose that, as stones by falling upon water put the water into an undulating motion and all bodies by percussion excite vibrations in the air, so the rays of light...
Page 119 - I stopped the prism and fix'd it in that posture, that it should be moved no more. For in that posture the refractions of the light at the two sides of the refracting angle, that is at the entrance of the rays into the prism, and at their going out of it were equal to one another.
Page 21 - ... and are not these vibrations propagated from the point of incidence to great distances < And do they not overtake the rays of light, and by overtaking them successively, do they not put them into the fits of easy reflexion and easy transmission described above...
Page 20 - Every Ray of Light in its passage through any refracting Surface is put into a certain transient Constitution or State, which in the progress of the Ray returns at equal Intervals, and disposes the Ray at every return to be easily transmitted through the next refracting Surface, and between the returns to be easily reflected by it.
Page 21 - And is not this Medium the same with that Medium by which Light is refracted and reflected, and by whose Vibrations Light communicates Heat to bodies .... And is not this Medium exceedingly more rare and subtile than the Air, and exceedingly more elastick and active?