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LIGHT AND SHADOW, POINTS TO REMEMBER, 1.SUNLIGHT IS THE NATURAL SOURCE OF LIGHT., 2.TWO SOURCES OF LIGHT ARE - NATURAL SOURCES AND ARTIFICIAL SOURCES, 3.THE RETURN OR THROWING BACK OF A SOURCE OF LIGHT IS CALLED REFLECTION., 4.OBJECTS THAT GIVE OUT LIGHT IF THEIR OWN ARE CALLED LUMINOUS OBJECTS., EX. SUN, TORCH, STAR ETC., 5.OBJECTS THAT DO NOT HAVE LIGHT OF THEIR OWN ARE CALLED NON - LUMINOUS, OBJECTS., 6.LIGHT TRAVELS VERY FAST. LIGHT INTERACTS WITH MATTER. LIGHT IS MADE UP OF, MANY COLOURS, LIGHT TRAVELS IN A STRAIGHT LINE. THESE ARE ALL PROPERTIES, OF LIGHT., 7.LIGHT TAKES JUST 8 MINUTES TO TRAVEL FROM THE SUN TO EARTH., 8.MATERIALS THAT LET THE LIGHT TO PASS THROUGH THEM ARE CALLED, TRANSPARENT MATERIALS., 9.MATERIALS THAT ALLOW ONLY SOME LIGHT TO PASS THROUGH THEM ARE CALLED, TRANSLUCENT MATERIALS., 10.MATERIALS THAT DO NOT ALLOW LIGHT TO PASS THROUGH THEM ARE CALLED, OPAQUE MATERIALS., 11.WHEN AN OBJECT BLOCKS THE LIGHT'S PATH THEN DARKNESS APPEARS ON THE, OTHER SIDE OF THE SOURCE OF THE LIGHT. THIS DARKNESS OR SPOT IS THE, SHADOW OF THAT OBJECT., 12.SHADOWS ARE ALWAYS BLACK IN COLOUR., 13.OUR SHADOWS ARE LONGER IN THE MORNING AND EVENING. AT NOON OUR, SHADOWS ARE SHORTEST.