Multiple choice

Why we cannot see the shadow of bird flying in the sky?

  1. The extended source of light (the Sun) is very large as compared to the opaque body (the bird).

  2. The bird is very small as compared to the diameter of the Sun.

  3. The umbra formed by the bird is so small that it finishes in the air while the penumbra formed is very light and faint, i.e. hardly visible.

  4. The shadow of the bird cannot be formed.

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The shadow of the bird cannot be formed because the extended source of light (the Sun) is very large as compared to the opaque body (the bird). The bird is very small as compared to the diameter of the Sun. The umbra formed by the bird is so small that it finishes in the air while the penumbra formed is very light and faint, i.e. hardly visible.

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