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Byju's Answer
Standard VII
Physics
Nature of Light
If the light ...
Question
If the light source is in the east, then the shadow of the object is seen on the ____
A
east
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B
south
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C
north
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D
west
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Q.
When an opaque object is placed in the path of light, a dark portion is formed on the opposite side of the object on the screen. This dark portion is a shadow. The size of shadow depends on the distance of the source of light and on the angle at which the light rays fall on the object. If the source of light is closer to the object, a larger shadow is formed than when the source of light is far from the object. Size of the shadow varies according to the presence of light coming from the different angles. If the distance between the source of light and an opaque object is decreased then the size of the shadow forms large dark patches. If the distance between the source of light and an opaque object is increased then the shadow is small. The shadow can be seen only on a screen. The ground, walls of the rooms, a building, or other such surfaces act as a screen for the shadows you observe in everyday life. Shadows are black in color and this is not changed by the color of the opaque objects. So a red and yellow rose will have the same black shadows.
Size of shadow depends on which of the following factors?
Q.
At which position a light source should be placed over a cylindrical object placed on a table, so that no shadow is seen?
Q.
When an object is placed _____ a light source, the shadow formed on the screen is _______.
Q.
What will be the shape of the shadows formed on screens A and B when both the torches are switched on?
I. The color of shadows is same as the color of the objects.
II. The size of a shadow will decrease if an object is moved away from a light source, keeping the positions of the source and the screen fixed.
III. The size of shadow will increase if an object is moved closer to the light source,
keeping the positions of source and screen fixed.
Q.
The size of a shadow will ______ if an object is moved away from a light source keeping the positions of the source and the screen fixed.
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