Why is a shadow obtained only on a screen?
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10
Answer:
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. ... The length and shape of a shadow depends on the object by which it is formed.
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4
Answer:
It is a virtual image formed by when the reflected rays are produced backwards. The rays don't actually meet.
Explanation:
Virtual images can only be obtained on a screen as they are not formed by the actual intersection of the reflected
rays.
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