The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 Fig. 183.—Apparatus for Polarisation by Reflection. The angle which the incident ray must make with the normal to the reflecting surface in order to be completely polarised, is the ANGLE OF POLARISATION. For glass the angle is 54° 35', for water, 52° 45', for quartz 57° 32', and for diamonds 68°. The PLANE OF POLARISATION is the plane in which the light be- comes polarised. Do
The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 Fig. 183.—Apparatus for Polarisation by Reflection. The angle which the incident ray must make with the normal to the reflecting surface in order to be completely polarised, is the ANGLE OF POLARISATION. For glass the angle is 54° 35', for water, 52° 45', for quartz 57° 32', and for diamonds 68°. The PLANE OF POLARISATION is the plane in which the light be- comes polarised. Doubly refractive substances may be detected by means of a polarising apparatus. Let two Nicol prisms be placed in line with their principal planes at right angles to one another, the extraordinary ray, transmitted by the first prism, will not be transmitted by the second, because it is at right angles; no light will, therefore, be visible on looking through the second prism. In this condition
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