Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 80
ctly 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,… … 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…
Light · Scientific recreations
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