Explain all the Principles and Characteristics of Shadows?
Answers
Answer:
* A shadow is actually just a space or region, where there is no light since an opaque object is blocking light rays. The position and intensity of the source of light affect the properties of the type of shadow that is formed. For example, let us consider the sun to be a light source. When it is early morning or late afternoon, you may notice that your shadows are elongated. But at noon, when the sun is right above your head, the shadow formed is short and dark in nature.
Also, you would’ve noticed that at noon, the shadows formed are more defined in nature when compared to late afternoon or early morning shadows which are slightly blurred with edges not defined very well. This is because when the light source is wider during these times.
* Light sources can be either point or non-point (extended) in nature. If it is a point source of light, then it forms a simple shadow called an umbra. If it is an extended light source, the shadow is divided into the umbra, penumbra, and antumbra. They can also be used to define levels of darkness, as is sometimes done when dealing with sunspots.
* Although shadows cast on surfaces are mostly two-dimensional in nature, they can also be seen to have a three-dimensional effect. For example, when a shadow is cast on dense mist or fog, you can observe this effect.
Also, you would’ve noticed that at noon, the shadows formed are more defined in nature when compared to late afternoon or early morning shadows which are slightly blurred with edges not defined very well. This is because when the light source is wider during these times.
Light sources can be either point or non-point (extended) in nature. If it is a point source of light, then it forms a simple shadow called an umbra. If it is an extended light source, the shadow is divided into the umbra, penumbra, and antumbra. They can also be used to define levels of darkness, as is sometimes done when dealing with sunspots.
Although shadows cast on surfaces are mostly two-dimensional in nature, they can also be seen to have a three-dimensional effect. For example, when a shadow is cast on dense mist or fog, you can observe this effect.
A shadow is a dark (real image) area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.
List three characteristics of shadow
It depends on the shape of the object. ...
It depends on the source of light whether it is plane parallel rays or spherical.
It depends on the position of the object whether the object is at an infinite or finite distance.
It depends on the position of the source of light.
Core shadows are an important feature in creating the volume or structure of an object. Cast shadows are created by the object itself, blocking a single light source or spotlight, which "casts" a shadow underneath or behind it. Every cast shadow can be broken down into three separate tones.
Light
On your way to school, you can see so many things around you, you see the buildings, car, trees, scooters and many more. Have you ever imagined how can you see these things? What enables us to see things around us?
During the day we get sufficient amount of light from the sun and so we can see the objects clearly. But when you enter a dark room, will you be able to see the objects around you? NO! Because there is no light present there.
Yes, we can see things in dark only when we switch ON the light. We can see the chairs, table, T.V, utensils and everything around you. Light is one of the important things that is required to see objects around us. It is the source of invisible energy which gives us the sensation of sight.
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