下列给出的光学器件中，利用凸透镜成像原理制成的是（ ）
A．投影仪
B．潜望镜
C．万花筒
D．穿衣镜
A、投影仪是根据凸透镜能成倒立、放大实像的原理制成的，利用的是光的折射；
B、潜望镜的主要部件是两面互相平行的平面镜，利用的是光的反射；
C、万花筒的图案是靠玻璃镜子反射而成的，其原理在于光的反射；
D、穿衣镜利用的是平面镜成正立、等大的虚像，其原理是光的反射；
故选A．
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| Jane's father is a businessman and he 1 English. Sometimes he travels all over the world for 2 company. In general, he has no trouble 3 people from different countries, 4 most of them can speak English. English is 5 used in the world. It's used as the first language by most people in Great Britain, America, Canada, Australia and New Zealand. Besides, it is used as a 6 language in India and some other 7 . Once in a while, he has to travel to a country where English is not 8 .Whenever that happens, he has to take an interpreter with him. The interpreter translates the languages and explains the culture of the country 9 him. 10 like to work with Jane's father. | |||
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