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Do you remember the concepts we studied in the previous lesson? First, we understood that OPAQUE objects do not allow light to pass through them. Second, TRANSPARENT objects allow light to pass through them and we can see through them clearly. And third, TRANSLUCENT objects allow light to pass through them partially. Now I want you to answer this question! What kind of an object is human body? Are we able to see THROUGH it? Not really! Hence a human body is an OPAQUE object! What happens when light is obstructed by the human body? We see that the human body is obstructing light here! There is light in front of the human body but what do you see behind it? Yes, a SHADOW. This thing you see behind the body is called a shadow! Now looking at this, can you tell me the things that are required for a shadow to be formed? Two things are obvious. First: a source of light, which is in front of the body. And second: an opaque object here the human body is the opaque object. Can you identify any
