Light Y - NCERT
Light Y ou might have seen a beam of sunlight when it enters a room through a narrow opening or a hole. You may have also seen beams of light fr om the headlamps of scooters, cars and engines of trains [Fig. 15.1 (a)]. Similarly, a beam of light can be seen from a torch. Some of (a) Rail engine Fig. 15.1 Beams of light (b) Light house
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