如图所示，一束光在空气和玻璃两种介质分界面上同时发生反射和折射，其中_1是折射光线，反射角等于_2．

题干

如图所示，一束光在空气和玻璃两种介质分界面上同时发生反射和折射，其中____是折射光线，反射角等于____．

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OA,40°

Sarah: Hi, friends! My parents will have a birthday party for me.

Amy: Great! When is your birthday?

Sarah: It's on May 12th. It's my eleventh birthday. Will you come?

Amy: Yes！What about you, John?

John: What day is your birthday?

Sarah: It's Saturday. We have no classes.

John: OK. I'll come. Do you like sports?

Sarah: Yes, I do. I like playing football very much.

John: Good! I'll give you a surprising gift.

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