第一部分(50分) 一、填充题(每格1分,共21分.) 1.通常认为光在空气中的速度是_米/秒,在阳光下立杆见影,这现象说明光在空气中沿_传播. 2.在折射现象中,折射光线跟入射光线和法线在__上.如果光垂直于分界面入射,通过分界面以后,光的传播方向_. 3.水银温度计、酒精温度计都是根据 The first part (50 points) First, fill in the question (1 point per division, a total of 21 points.) 1. It is generally believed that the speed of light in the air is _m/s, which is immediately visible in the sun. This phenomenon shows that the light is In the air, along the _ propagation. 2. In the refraction phenomenon, the refracted ray with the incident light and the normal on the __. If the light is incident perpendicular to the interface, through the interface, the direction of light propagation _. 3. Mercury thermometer, Alcohol thermometers are based