Explanation:

When an opaque object is placed close to the screen and away from the source of light, the size of its shadow decreases.

Reason:

The size of a shadow depends on the relative positions of the object, the source of light, and the screen. When the object is close to the screen and away from the source of light, the following factors contribute to the decrease in the size of the shadow:

1. Distance between the object and the screen: When the object is close to the screen, the distance between the object and the screen is reduced. As a result, the shadow formed on the screen becomes smaller in size.

2. Angle of incidence: The angle at which light rays from the source hit the object also affects the size of the shadow. When the object is close to the screen, the angle of incidence decreases. This means that the light rays from the source hit the object at a smaller angle, resulting in a smaller shadow.

3. Distance between the object and the source of light: When the object is away from the source of light, the distance between the object and the source of light increases. This increase in distance causes the light rays to spread out more, resulting in a larger area covered by the shadow. However, since the object is close to the screen, the shadow formed on the screen is smaller in size.

Conclusion:

In summary, when an opaque object is placed close to the screen and away from the source of light, the size of its shadow decreases. This is because the reduced distance between the object and the screen, the smaller angle of incidence, and the larger distance between the object and the source of light all contribute to the decrease in the size of the shadow.

Explanation:
When an opaque object is placed close to the screen and away from the source of light, the size of its shadow decreases. This is because the shadow is formed by blocking the light from reaching the screen. There are a few reasons why the shadow size decreases in this scenario.

Distance from the Light Source:
The size of a shadow is directly proportional to the distance between the object and the light source. When the object is close to the screen and away from the light source, the distance between the object and the light source increases. As a result, the size of the shadow decreases.

Angle of Incidence:
The angle at which the light rays hit the object also affects the size of the shadow. When the object is close to the screen, the angle at which the light rays hit the object is smaller. This results in a smaller shadow being cast on the screen.

Screen Size:
The size of the screen also plays a role in determining the size of the shadow. When the object is close to the screen, the shadow is cast on a smaller area of the screen. As a result, the size of the shadow appears smaller.

Intensity of Light:
The intensity of the light source can also impact the size of the shadow. When the object is close to the screen and away from the light source, the intensity of the light reaching the object decreases. This can result in a less defined and smaller shadow being formed on the screen.

Overall, when an opaque object is placed close to the screen and away from the source of light, the size of its shadow decreases. This can be attributed to the increased distance from the light source, smaller angle of incidence, smaller area of the screen being affected by the shadow, and lower intensity of light reaching the object.