Write the answer to the following.
A)What things are necessary for the formation of a shadow?
B)when can an object be seen?
C)What is a shadow?

A)​Shadow needs two things to form: 1.Light. Basically an object that does not allows any light to pass through will form a shadow. Shadows are formed by light, because if light shines onto an object, and the object blocks the light, the light will go sideways of the object, and therefore, a shadow is formed.
B)The bottom line is: without light, there would be no sight. The visual ability of humans and other animals is the result of the complex interaction of light, eyes and brain. We are able to see because light from an object can move through space and reach our eyes. Once light reaches our eyes, signals are sent to our brain, and our brain deciphers the information in order to detect the appearance, location and movement of the objects we are sighting at. The whole process, as complex as it is, would not be possible if it were not for the presence of light. Without light, there would be no sight.
C)A shadow is a dark 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.
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A)The three things to form a shadow are:
I)A source of light.
II)An opaque object to block the light.
III)A surface behind the object to make the light fall on it.
An opaque object objects or blocks the light falling on it.This leads to darkness on the side of the object.This area of darkness is known as Shadow.
B)Light from luminous objects travels indefinitely until it collides with matter in its path to be partially absorbed and reflected. Objects are seen when light enters the eye from luminous objects or enters the eye after reflection from non-luminous objects to the eye.
C)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.
 
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