在玻璃（折射率n3=1.60）表面镀一层MgF2（折射率n2=1.38）薄膜作为增透

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问题单项选择题

在玻璃（折射率n₃=1.60）表面镀一层MgF₂（折射率n₂=1.38）薄膜作为增透膜。为使波长为5000A的光从空气（折射率n₁=1.00）正入射时尽可能少反射，MgF₂薄膜的最少厚度应是（）。

A.A

B.B

C.C

D.D

答案

参考答案：D

补全对话，情景问答

补全对话，根据对话内容，填入符合句意的词。每空一词。

A: At last, we're here! Can you believe we are in the Lee City 1 ?

B: Yeah, my dream comes 2

A: I wonder whether I am in the real ice world.

B: I've heard so much about it. Now I know why people want to spend 3 here.

A: Sure. Look at white snow. Would you take a 4 of me?

B: All right. Use this camera.

A: How can I get to the Dragon 5 ?

B: I know the way to the Dragon Tower.1 will show you.

A: Thank you very much.

B: You're welcome.

1. _____ 2. _____ 3. _____ 4. _____ 5. _____

单项选择题

遇到这种情况的路口，以下做法正确的是什么？（）

A．沿左侧车道掉头

B．该路口不能掉头

C．选择中间车道掉头

D．在路口内掉头