Một tia sáng hẹp đi từ môi trường trong suốt vào không khí. Tia sáng tới hợp với mặt phân cách một góc bằng 60o. Khi đó tia khúc xạ và tia phản xạ vuông góc với nhau. Góc tới giới hạn của môi trường này có sin bằng. Chọn câu trả lời đúng:

A. 0,5

B.  3 2

C.  3 3

D.  3

300

tick cho mình nhé

Hàm số y=f(x) có đồ thị như hình vẽ không liên tục tại điểm có hoành độ bằng bao nhiêu?

A. -2

B. 0

C. 1

D. 2

1.I(not play) am not playing school lunch with my new friends

2.Shh! they(study) are studying in the libraly

3.Vy and phong(not do) aren't doing their homework

4.Now I (have) am having an english lesson with MrLee

5.Phong,Vy and Duy (ride) are riding their bicycles to school now

There are more vivid moments as time passes. Countless reunion as well as yesterday's separation seems to happen at this moment. Each intersection or small alley placed on it has its own reason in our lives. This is the moment that I want to look forward to. At that moment of sudden silence, I suddenly felt the wonderful color of life. The existence of each individual makes a difference. Even if this was a dream, it was still my own decision to make that choice. Why should the moment that was supposed to be the happiest be so scary in the first place? Chaining the milestones, I realized that behind my eyes was the glittering world. All is just lies. It's as if everything will collapse with just a light breeze. I turned my back, flinched and closed my eyes. I am scared to face my true self. Once we have achieved our will, will any error, every hysteria be removed? Will we be back to that happy time? And we will face another storm. To be able to resist, love without fear, hesitation and separation, simply live true to yourself

1.d

2.b

3.c

4.c

5.g

6.a

7.h

8.f