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The length of...

Question

The length of the shadow will be longest when the _________.
(A) Angle between the source of light and the object is 45°
(B) Source of light and the object are parallel to each other
(C) Source of light and the object are perpendicular to each other
(D) Angle between the source of light and the object is 60°

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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?

Name the things other than a source of light and opaque object required to see the shadow.

To form a shadow, the things required are: a source of light, an opaque object and a screen.

Q. The shape and size of a shadow depends on
(a) the shape and size of the object.
(b) the position of the source of light.
(c) the distance between the source of light and object.
(d) all of the above

A dark patch formed on a screen when an opaque object comes between the source of light and the object is called _________________

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