第七章测试1.
You are standing on the shore of a lake. You spot a tasty fish swimming some distance below the lake surface. If you want to spear the fish, should you aim the spear （ ）.
A:directly at the apparent position of the fish B:below the apparent position of the fish C:over the apparent position of the fish D:Not enough information
答案:B
2.
You are standing on the shore of a lake. You spot a tasty fish swimming some distance below the lake surface. If instead you use a high-power laser to simultaneously kill and cook the fish, should you aim the laser （ ）.
A:directly at the apparent position of the fish B:Not enough information C:below the apparent position of the fish, D:over the apparent position of the fish, 3.The angle of reflection is equal to the angle of incidence for all wavelengths and for any pair of materials. （ ）
A:错 B:对 4.The index of refraction depends not only on the substance but also on the wavelength of the light. （ ）
A:对 B:错 5.the frequency of the wave does not change when passing from one material to another. （ ）
A:对 B:错
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