Light; a course of experimental optics, chiefly with the lantern . Fig. .dL. Fig. 38.—Total Reflection. be readily seen that the angle of total reflection must de-crease^ as the index of refraction increases; but this will be 1 The limiting angle is about 48°, but we go on the safe side. ?^ Never forget that these angles measure from the normal. Thephenomena of total reflection may be observed by the private studentby looking at the under-surface of the water in a tumbler held rather III.] FOUNTAIN OF FIRE. 55 shown by a beautiful experiment when we come to studythe subject of colour. 33.
Light; a course of experimental optics, chiefly with the lantern . Fig. .dL. Fig. 38.—Total Reflection. be readily seen that the angle of total reflection must de-crease^ as the index of refraction increases; but this will be 1 The limiting angle is about 48°, but we go on the safe side. ?^ Never forget that these angles measure from the normal. Thephenomena of total reflection may be observed by the private studentby looking at the under-surface of the water in a tumbler held rather III.] FOUNTAIN OF FIRE. 55 shown by a beautiful experiment when we come to studythe subject of colour. 33. A Luminous Cascade.—There is another verybeautiful method in which total reflection may be illustratedby the lantern, called the luminous cascade, or fountainof fire, which may be arranged so as to be very effectiveby simple means. Get a two-necked glass receiver () about 4^ inches diameter, withas large necks as possible, and J ^ in each neck fix by corks glass jf pL tubes of similar size, as large as /possible, not less than | mch clear /bore, and |- inch
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Keywords: ., bookcentury1800, bookdecade1880, bookidcu3192403121, bookyear1882
