. A text book of physics, for the use of students of science and engineering . Fig. 528.—Internal reflection. being reflected along BD angle of refraction is 90 sin EBQ = ll and since <in 90° sin 90° - 1 ;1 sine dl critical angle = Ex it. 12G.—Total reflection by a glass Mace a glass prism upright upon a piece ofdrawing paper-, and draw in its outline ABC(Fig. 529). Place vertical pins at D and E sothat DE is nearly normal to the face AB. On. Fig. 529.—Internal reflectionin glass prism. XLV TOTAL REFLECTION 581 looking through the face BC the images of the pins will be seen at E and
. A text book of physics, for the use of students of science and engineering . Fig. 528.—Internal reflection. being reflected along BD angle of refraction is 90 sin EBQ = ll and since <in 90° sin 90° - 1 ;1 sine dl critical angle = Ex it. 12G.—Total reflection by a glass Mace a glass prism upright upon a piece ofdrawing paper-, and draw in its outline ABC(Fig. 529). Place vertical pins at D and E sothat DE is nearly normal to the face AB. On. Fig. 529.—Internal reflectionin glass prism. XLV TOTAL REFLECTION 581 looking through the face BC the images of the pins will be seen at E andD. Place two other pins L and M in line with E D, and draw the linesDEF and MLH. The ray DE entered the prism at F and left it at H, beingtotally reflected at G. To find the point G, draw FR perpendicular to ACand make PR = FP. Join RH, thus determining G by the intersection ofRH and AC. This follows from the laws of reflection in a manner similarto that given on p. 554. Measurement of fi by the method of total reflection.—Several methods of measuring /x by making use of the relation sin i = 1 Ifi have been devised. One C
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
