Have you ever used a telescope? Most people think of telescopes only as something that you use to look at the stars in the sky, but if you have ever looked through a camera lens or used a pair of binoculars, you have used a telescope.
Telescopes have been around for a long time. We know for sure that people used them in the 1600's in Europe. Some people even think that people in other parts of the world were using telescopes thousands of years ago.
Telescopes make things that are far away look closer and brighter. It isn't magic. It's science. When light moves through different things, like air, a lens or water, it slows down or speeds up. At the place where this happens, to our eyes, it looks like the things we see are split in two.
You can see for yourself. Put a pencil in a glass or bowl of water. Make sure it's slanted, and then look to see how it looks like the pencil is split in two where the water meets the air.
Long ago, scientists learned that light does this, and figured out how to use this fact to build a telescope.(Kayleen Hartman, Staff Writer)
1. lens n.
鏡片 (jing4 pian4)
例: When I dropped my glasses one of the lenses broke.
2. brighter adj.
較明亮的 (jiao4 ming2 liang4 de5)
例: The sun is brighter than the moon.
3. slanted adj.
傾斜的 (qing1 xie2 de5)
例: The floor of that old house is slanted. If you put a ball on the floor, it will roll to one side of the house.