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Discover how light travels in a straight line and how shadows are formed when an object blocks the light rays. Learn about the science behind shadow formation and how it relates to the position of the sun. Explore the Sundial and how it can tell time based on shadow position.
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Shadows Page E101
How does light travel? • Light travels in a straight line.
Shadow Formation • Shadows form when a person or an object blocks the flow of light rays.
Jimmy’s hand is blocking the beam of light coming from his flashlight. Therefore, he can create the shadow image on the wall.
When you stand in the sunlight, you block the flow of the sun’s rays. This is why your shadow forms. Sun and ShadowHow does it work?
More Information • When the sun is low in the sky, either early in the day or late in the day, longshadows form. Shadows at sunset
When the sun is high in the sky, in the middle part of the day, shadows are short.
The Sundial • A sundial can be used to tell the time of day, based on the position of the shadow on the dial. • In the morning, the shadow falls on the east side of the dial. • Later in the day, it falls on the west side.