What's going on: Light travels in straight lines

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What's going on: Light travels in straight lines발음듣기

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The important concept to understand the colored shadows is that light travels in straight lines.발음듣기

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I'm gonna show that using this ruler.발음듣기

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I'm gonna put the one end of the ruler at the center of the red bulb.발음듣기

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It shows the light traveling along one path to the screen.발음듣기

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Of course, light from the red bulb hits everywhere on the screen traveling in straight lines, however along this path, if I put the pencil there, the pencil blocks the light traveling in a straight line along the ruler, and makes a shadow on the wall.발음듣기

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However, light from the blue bulb also travels in straight lines, and its straight line misses the pencil, and fills in the shadow from the red light.발음듣기

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