Question

explain with the help of a diagram why birds and aeroplanes do not cast their shadows on their ground​

Answer 1

Answer:

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 the large distance.

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Answer 2

Answer:

Birds flying high in the sky do cast their shadow but because they are shading an area that is very tiny, the shadow is not visible. The higher the bird flies, the smaller the shadow it casts. Answer: ... And, because of geometric optics, the shadow will be more diffuse when the object is higher in the sky.