Question

Birds flying high in the sky do not cast their shadow.

• A. True
• B. False

Answer 1

The correct option is A True

1. A dark patch formed behind an opaque body, when it is placed in the path of light is called a shadow. It is a region of an absence of light.
2. A shadow has two regions.
3. A region of total darkness is called the umbra. No ray of light enters this region.
4. A region of partial darkness which surrounds the umbra is called the penumbra.
5. When a bird is flying high in the sky, it is a case in which the extended source of light is very large as compared to the opaque body.
6. The bird is too small as compared to the diameter of the sun.
7. The umbra formed by the bird is so small that it finishes in the air.
8. The penumbra formed by the bird is very large and very faint.
9. Thus, it is hardly visible.

Hence, the statement is true.