Question

2. why do areoplane and bird flying in the sky not cast a shadow on the ground.
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Answer 1

Answer:due to large distance

Explanation:

in this case the bird is opaque body and the earth's surface is a screen. When the bird is flying high in the sky the distance between the body and the surface of the earth is too large and hence even though the light is obstructed by the bird's body it cannot cast its shadow due to large distance.