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www.GOALias.blogspot.com1515 LightYou might have seen a beam ofsunlight when it enters a roomthrough a narrow opening or a hole.You may have also seen beams of light fromthe headlamps of scooters, cars and enginesof trains [Fig. 15.1 (a)]. Similarly, a beamof light can be seen from a torch. Some of(a) Rail engineFig. 15.1 Beams of lightyou may have seen a beam of searchlightfrom a light house or from an airporttower [Fig. 15.1 (b)].What do these experiences suggest?15.1(b) Light house15.1 LIGHTTRAVELSALONG ASTRAIGHTLINEBoojho recalls an activity he performedin Class VI. In that activity he looked(a)(b)Fig. 15.2 Looking at a candle through a straight and a bent pipe174SCIENCE