Question

c. Write 5 facts about shadows.​

Answer 1

Answer and Explanation:

7 interesting facts about light and shadow:-

• A shadow happens when an object blocks the sun’s rays. Shadows are longer in the winter because of the angle of the sun.
• Your shadow is longest in the early morning and in the late afternoon. In the afternoon, when the sun is directly above you, your shadow leaves your side for a little while. The sun makes the longest shadows at the beginning and at the end of the day because at that time, the sun is lowest in the sky and aimed at the sides of the various things on the earth. When the sun is directly above you, there is little or no shadow because the light from the sun is falling upon you from all the sides and there is hardly any dark region.
• A long time ago, people observed the way shadows were formed by the sun and utilized this principle in making the world’s most primitive clocks, the sundials.
• The first person to calculate the size of the planet Earth with a high degree of accuracy used simple geometric equations and measurements of shadows. Eratosthenes, the head librarian of the Great Library of Alexandria, performed this feat over 2,000 years ago, around 250 BCE.
• Does everything has a shadow? Take a look around and see what all things form shadows. You will notice that swings, trees, cars, tables and almost everything else has a shadow. Any object – living or non living that can block light can cast shadows.
• Is there anything that doesn't have a shadow? Some objects, such as glass, are transparent. Light can shine through them. Some light shines through translucent objects, such as a balloon or sheet of wax paper. Light cannot shine through opaque objects and you can’t see through them. Opaque objects, including a desk, bath towel or blanket, are solid.
• The smaller the angle between an elongated object and the direction of the light is, the shorter the shadow is. On the other hand, the smaller the angle between the direction of the light and the surface on which the shadow occurs is, the longer the shadow is.
• If the object is close to the light source, the shadow is large.  
• If the surface is curved there are further distortions.
• For non-point sources of light, the shadow is divided into the umbra and penumbra. The wider the light source, the more blurred the shadow.
• If there are multiple light sources there are multiple shadows, with overlapping parts darker. For a person or object touching the surface, like a person standing on the ground, or a pole in the ground, these converge at the point of touch.

Answer 2

Answer:

When an impervious item blocks light from a light source, it creates a shadow, which is a dark region. It takes up the entire three-dimensional space behind a light-emitting device. A shadow's cross section can be thought of as a backward projection of the item that is obstructing the light in two dimensions.

Explanation:

Facts about shadow:

1. When an item blocks the sun's beams, a shadow results. Due to the sun's angular position, shadows are lengthier in the winter.
2. Early in the day and late in the day are when your shadow is the longest. Your shadow briefly leaves your side in the afternoon when the sun is straight overhead. Because the sun is lower in the sky and facing the sides of various objects on the earth at certain times, it casts the largest shadows at the start and conclusion of the day. There is scarcely any shadow when the sun is directly overhead since the light from the sun is coming upon you from all sides.
3. People long ago noticed the way the sun cast shadows and used this knowledge to create the earliest basic clocks known as sundials.
4. The shadow of an extended object is shorter the smaller the angle between it and the source of the light. On the contrary hand, a longer shadow results from a narrower angle between the light's direction and the surface it casts.
5. The shadow is huge if the item is near the source of light.
6. Further distortions result from a curved surface.
7. The shadow and outer layers are the two halves of the shadow cast by non-point light sources. The shadow becomes more hazy the wider the light source.

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