How can you show that screen is necessary to obtain a shadow?
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Explanation:
Sun is not always necessary to observe a shadow because any source of light, an opaque object and a screen are just necessary enough to see a shadow. Question 5: Paheli observed the shadow of a tree at 8:00 am, 12:00 noon and 3:00 pm.
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A shadow is a dark region, and is formed only when a light source, an opaque object and a screen are present. Opaque objects form shadows because light is not able to bend around them. Shadows are seen more clearly on light screens. .
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