Chiếu 1 tia sáng SI tới gương phẳng như hình vẽ. Nếu quay tia này quanh điểm S một góc anpha trong mặt phẳng hình vẽ thì tia phản xạ quay một góc bao nhiêu?

Which safety measures should you follow during a thunderstorm? check all that apply. (a) avoid touching anything that conducts electricity. (b) avoid touching a person who has been struck by lightning. (c) go outside. (d) keep your computer turned off. (e) stay out of water. (f) stay inside.

What will a positive and a negative charge do if they are separated from each other?

Ways that industry and agriculture use physical properties to separate substances