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Introduction to Measurements

When an objec...

Question

When an object is placed the light source, the shadow formed on the screen is .

A

closer to

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B

bigger

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C

same size as object

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D

farther away from

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Solution

The correct option is B bigger
When an object is placed closer to the light source, the shadow formed on the screen is bigger than the object. As the distance between the light source and object increases, the shadow size decreases.

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Draw the shadow of the following object when this is kept infront of a light source and an image is formed on the screen.

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. 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.

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

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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