Have you ever been followed by your shadow? Or have you ever followed it? Shadows are formed because light travels in straight lines. On cloudy days, it can seem as if there are no shadows at all. Yet on a clear day, if you stand with your back to the sun, you are sure to see your shadow. Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow. The center part of the shadow, which gets no light at all, is the darkest part and is called the umbra. The rest of the shadow is lighter because it gets light from some parts of the source of light, and is called the penumbra.
Through the activities presented in the lesson, students will become familiar with the causes for formation of shadows, an understanding that the shape and length of shadows are dependent upon the position and manipulation of the light source. After a close examination of Web sites and video segments, students, through "free play," will create shadows, compare the size and shape of the shadow with the actual object, engage in shadow play theatre, and discover what happens to shadows when there is much light as compared to little light. Students will measure shadows and draw inferences from the data collected, and finally, using trigonometric functions, calculate heights of objects based on the length of the shadow the objects cast.
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Answer:
Have you ever been followed by your shadow? Or have you ever followed it? Shadows are formed because light travels in straight lines. On cloudy days, it can seem as if there are no shadows at all. Yet on a clear day, if you stand with your back to the sun, you are sure to see your shadow. Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow. The center part of the shadow, which gets no light at all, is the darkest part and is called the umbra. The rest of the shadow is lighter because it gets light from some parts of the source of light, and is called the penumbra.
Through the activities presented in the lesson, students will become familiar with the causes for formation of shadows, an understanding that the shape and length of shadows are dependent upon the position and manipulation of the light source. After a close examination of Web sites and video segments, students, through "free play," will create shadows, compare the size and shape of the shadow with the actual object, engage in shadow play theatre, and discover what happens to shadows when there is much light as compared to little light. Students will measure shadows and draw inferences from the data collected, and finally, using trigonometric functions, calculate heights of objects based on the length of the shadow the objects cast.
Explanation:
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