Khi chiếu một tia sáng lên gương phẳng ta thu được tia phản xạ tạo với tia tới một góc 60 . Hỏi góc tới bằng bao nhiêu.

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  If he __________ cleverer, he __________ so foolishly yesterday.

• Choose the best answer for the following sentence:

  If I __________ English well, I ____________ the article long ago.
  
  
  

• Choose the best answer for the following sentence:

  I ____________ part in the last competition if I __________ younger.
   

• Choose the best answer for the following sentence:

  If he _________ his work yesterday, he __________ free today.
   

• Choose the best answer for the following sentence:

  If you ____________ into accounts his behavior then, you ____________ so much trouble now
  
   

• Choose the best answer for the following sentence:

  You ___________ a star now if you ____________ the part in the film then.
  
  

• Choose the best answer for the following sentence:

  Joe seemed to be in good mood, _________ he snapped at me angrily when I asked him to join us.
   

• Choose the best answer for the following sentence:

  __________ Jane arrives, we will have finished this group project.
   

• Choose a word that has different stress pattern:

  partnership               romantic                 actually                attitude

• Choose a word that has different stress pattern:

  believe               marriage                response                 maintain