Answer:
Opaque objects do not allow light to pass through them. When an opaque object is placed in the path of light, then the light is obstructed by the object leading to the formation of a dark patch known as the shadow of that object, which can be taken on a screen placed behind it. Shadow formation: To form a shadow, there must be (i) a light source (ii) a screen (iii) an opaque object placed between the light source and the screen. For shadow formation, we can follow the given steps: Step 1: Take an opaque object. Step 2: Throw light on it from a light source. Step 3: Put a screen behind the object. In this way, a shadow of an object can be obtained on the screen.
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