To a detector set up to receive microwaves on the other side of the ring,it looks as if thewaves never changed their paths as if there were no object in the way! So,the ring is effectively invisible.
When the researchers put a small cdpper loop inside the ring,it,too,is nearly invisible. However,the cloaking device and anything inside it do cast a pale shadow.And the deviceworks only for microwaves,not for visible light or any kind of electromagnetic radiation.So,Harry Potters invisibility cloak doesnt have any real competition yet.
词汇:
invisibility/invizE5biliti/n.看不见,无形 spectrum/5spektrEm/n.光谱
cloak/klEuk/斗篷,披风 infrared/5infrE5red/adj.红外线的
microwave/5maikrEuweiv/n.微波 ultraviolet ray 紫外线
reconstruct/5ri:kEn5strQkt/v.重建 gamma ray 伽马射线
radiant/5reidjEnt/adj.辐射的 wavelength/5weivleNW/n.波长
electromagnetic/IlektrEJ5mA^nItIk/adj.电磁的coaster/5kEustE/n.托盘,垫子
练习:
1.Harry Potter is mentioned in the passage,because scientists
Acan now make an invisible cloak of the same kind as he uses.
Btry to make an invisible cloak of the same kind as he uses.
Ctry to invent a device Similar in idea to the invisible cloak he uses.
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