【简答题】三个偏振片P1,P2与P3堆叠在一起,P1与P3的偏振片化方向相互垂直,P2与P1的偏振化方向间的夹角为30°。强度为I0的自然光垂直入射于偏振片P1,并依次透过偏振片P1 、P2与P3,则通过三个偏振片后的光强为()。 (A) I0/4 (B) 3I0/8 (C) 3I0/32 (D) I0/16
【单选题】Which of the following songs does not belong to Dylan's works?
C.
The Times They Are a-Changin
【单选题】4 Which of the following songs is not sung by Carpenters?
D.
Nothing’s gonna change my love for you
【单选题】三个偏振片P1,P2与P3堆叠在一起,P1与P3的偏振片化方向相互垂直,P2与Pl的偏振化方向间的夹角为30°。强度为I0的自然光垂直入射于偏振片P1,并依次透过偏振片P1、 P2与P3,则通过三个偏振片后的光强为( )。
【单选题】P1,P2和P3三个偏振片堆叠在一起,其中P2与P1的偏振化方向间的夹角为30°,P1与P3的偏振方向相互垂直。若强度为I0的自然光垂直入射于偏振片P1,并依次透过偏振片P1,P2与P3,则通过三个偏振片后的光强(忽略偏振片的吸收)为( )。
【单选题】2 Which of the following songs is not sung by Celine Dion?
【单选题】1 Which of the following songs belongs to American country music?
C.
Take me home, country roads
【单选题】牛和羊在分娩过程中,如果是正生,胎儿通过母体盆腔最为困难的部位是()