圖片參考：http://imgcld.yimg.com/8/n/HA00688357/o/701003260082513873369660.jpg
35.
A light ray P is totally reflected in a medium X as shown below. Which of the following statement(s) is/are correct?
The angle a is greater than the critical angle.
The refractive index of medium X is smaller than that of medium Y.
The intensity of the light ray Q increases if angle a is further increased.
A. (1) only B. (1) and (2) only
C. (2) and (3) only D. (1), (2) and (3)
更新1:
1不用解釋
更新2:
不是不用解釋,只是第1小項不用解釋
更新3:
解釋= =