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Light travels more slowly in materials like glass than it does in air. Symmetrical objects like lenses can refract light in regular ways, to make images.
Hold one facing a window. Hold a screen made of card or paper on the other side of the lens. If you move the screen around, trying different distances between the lens and the screen, you should be able to make an image of the window and the view outside. Two convex lenses, a fatter one and a thinner one, can make a telescope. The fatter one needs to be the one nearer your eye. Use the lenses to see if you can make a simple telescope. 
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refraction
Your eyes
Take some convex lenses. (They are the ones that are fatter in the middle.)
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