Listening Quiz: Hướng Dẫn về Căn Chỉnh Thí Nghiệm Quang Học – Advanced Level

1. What is the conversation mainly about?
2. What does Jessica say John should do first?
3. Why does Jessica say the beam splitter should be placed precisely in the middle?
4. How can John check whether the beam is straight?
5. What should John do if the beam is still not aligned after making adjustments?

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