Gilbert light experiments for boys . GILBERT LIGHT EXPERIMENTS 77 RM is always exactly three-fourths the length of IM nomatter how large or small imay be. If the light passes inthe opposite direction, the samerelation holds until the criticalangle is reached. (See page 87for definition of critical angle.) If the ray is passing fromair to glass, RM will always betwo-thirds of IM, and this rela-tion holds if the light passesfrom glass to air, until the criti-cal angle is reached. This gives you the relation between the angle of incidenceand the angle of refraction in all Fig. 119. RM is
Gilbert light experiments for boys . GILBERT LIGHT EXPERIMENTS 77 RM is always exactly three-fourths the length of IM nomatter how large or small imay be. If the light passes inthe opposite direction, the samerelation holds until the criticalangle is reached. (See page 87for definition of critical angle.) If the ray is passing fromair to glass, RM will always betwo-thirds of IM, and this rela-tion holds if the light passesfrom glass to air, until the criti-cal angle is reached. This gives you the relation between the angle of incidenceand the angle of refraction in all Fig. 119. RM is throe-fourths of IM inwater and two-thirds of IM in glassFrom Lyndes Physics of the House-hold, published by The Macrnillan Co. FUN BY DAY OR NIGHTExperiment No. 68. Magic lead pencil. Put a pencil ina glass of water in a slanting direction and sight along it (Fig. 120). Does it appear to bebent up? It does,because the lightfrom it is bentas shown inFig. 121. E x p e r i mentNo. 69. Magicruler. Put a rulervertically in apitcher of water Fig. 120. You see a bent pencil to a depth of 4
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