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Physics, 01.11.2021 21:20 jazzy9438

Câu 2. Cho một bóng đèn pin đang được bật sáng như hình vẽ. a. Chùm sáng do dây tóc bóng đèn phát ra là chùm sáng gì?
-Phân kì
b. Dùng một tờ bìa có đục một lỗ tròn nhỏ. Hãy nêu cách làm để khẳng định kết luận về
tên gọi của chùm sáng vừa trả lời ở câu a.

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Câu 2. Cho một bóng đèn pin đang được bật sáng như hình vẽ. a. Chùm sáng do dây tóc bóng đèn phát...

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