With your flashlight, shine a beam of light down a hall or across the room. What do you notice about the beam? Can you see it? Does it seem to travel in a line? Is the path curved?

This is a picture of a laser beam travelling through murky water. Note the laser at the left side of the tank. What do you notice about the path of the laser light?

This is a picture of a light beam going through a block of glass. Disregarding what is happening at the edges of the glass, what is the path of light in the glass?

How does light reflect from things?

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