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一、单项选择题 1.关于光的传播下列说法中正确的是:( ) A.光总是沿直线传播的. B.光的传播速度是3×10~8米/秒. C.发散光束经平面镜反射后仍是发散光束. D.光从水中射向玻璃时,有可能发生全反射 2.入射光线d经过两个互相垂直的平面镜反射的光路如图1所示。O为入射点,b为出射光线,现在把两平面镜以过O点垂直于纸面的直线为轴顺时针转过一小角度α,则:( )
First, single-choice questions 1. About the propagation of light The following statements are correct: () A. The light always travels in a straight line. B. The light travels at a speed of 3 x 10–8 m/sec. C. Divergent light beam After the reflection by the plane mirror is still a divergent light beam. D. When the light is emitted from the water towards the glass, total reflection may occur 2. The incident light ray d is reflected by two mutually perpendicular plane mirrors as shown in FIG. 1. O is the incident point, and b is the outgoing light. Now rotate the two plane mirrors clockwise through a small angle α with the line passing through the O point perpendicular to the paper as the axis: ()