ow a horizontalbeam of light on to a mirror from which it can be reflectedupwards as in fig. 43, so as to fall obliquely on one of the verticalfaces of the tank. When the angle of incidence on this faceis considerable, the angle between the refracted ray and thenormal to the horizontal surface of… … Fig. 43. The angle which the refracted ray makes with the normalto the horizontal surface is increased and can be madegreater than the critical angle. The light ceases to emerge atthe top of the water and is all totally reflected and its path canbe seen in the water. (&) Look at a small gas…
Heat · Light
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