4.2光的反射--2024-2025学年人教版（2024）物理八年级上册

4.2 光的反射 第四章 光现象 八年级物理上册 1 思考：以下物体能够发光吗？你是怎么看到的？ 光遇到桌面、水面以及其他许多物体的表面都会发生反射。我们能够看见不发光的物体，是因为物体反射的光进入了我们的眼睛 一、光的反射定律 一、光的反射定律 一、光的反射定律 一、光的反射定律（实验） （1）实验器材： 平面镜 激光笔 直尺 量角器 折转的白色硬纸板 （2）器材放置： 平面镜放置在水平桌面上 白色硬纸板竖立在平面镜上 （3）多次改变入射光线角度，观察现象。 一、光的反射定律（实验） 一、光的反射定律（实验） 反射光线、入射光线、法线在同一平面内 三线共面 反射光线、入射光线分居法线两侧 法线（角平分线） 反射角等于入射角☆☆（前后顺序） 两角相等 一、光的反射定律（结论） 二、光路的可逆性 三、光的反射（光路图） 1993年俄罗斯航天局在自己的空间站实施了“人造月亮”的计划，既然月亮会发光是因为太阳光的反射，那弄一面大镜子反射太阳光就行了，他们成功反射了太阳光，在地面形成了一个直径4千米的光斑。 四、光的反射定律（应用） 二战期间，德国著名火箭科学家赫尔曼·奥伯特曾设想制造太空武器“太阳炮”：向太空发射一个由金属钠制成，直径超过100米的巨型反射器，利用它将太阳的能量聚焦在地球上的某个地点，从而焚毁敌方城市，或者将海洋部分区域变成沸水。 四、光的反射定律（应用） 四、光的反射定律（应用） 镜面很平整、光滑 镜面凹凸不平 五、镜面反射和漫反射 五、镜面反射和漫反射（例子） 五、镜面反射和漫反射（月光） 迎着月光走：亮的地方有积水（发生镜面反射） 暗的地方没有积水（发生漫反射） 背着月光走：亮的地方没有积水（发生漫反射） 暗的地方有积水（发生镜面反射） 六、光的反射（找光源） huohua_res/gv9EgCoVv/config.json { "name": "探究光反射时的规律", "file": "v.mp4", "totalTime": "92", "steps": [ { "name": "实验器材展示", "time": "11.8", "start": "0", "end": "11.8", "isPlaying": false }, { "name": "法线居中", "time": "10.5", "start": "12", "end": 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m.target=null,m.data.global=t,e||(e=this.scene),this.processInteractive(m,e,null,!0),m.target}},{key:"setTargetElement",value:function(t){this.removeEvents(),this.interactionDOMElement=t,this.addEvents()}},{key:"addEvents",value:function(){this.interactionDOMElement&&!this.eventsAdded&&(this.emit("addevents"),this.interactionDOMElement.addEventListener("click",this.onClick,!0),window.navigator.msPointerEnabled?(this.interactionDOMElement.style["-ms-content-zooming"]="none",this.interactionDOMElement.style["-ms-touch-action"]="none"):this.supportsPointerEvents&&(this.interactionDOMElement.style["touch-action"]="none"),this.supportsPointerEvents?(window.document.addEventListener("pointermove",this.onPointerMove,!0),this.interactionDOMElement.addEventListener("pointerdown",this.onPointerDown,!0),this.interactionDOMElement.addEventListener("pointerleave",this.onPointerOut,!0),this.interactionDOMElement.addEventListener("pointerover",this.onPointerOver,!0),window.addEventListener("pointercancel",this.onPointerCancel,!0),window.addEventListener("pointerup",this.onPointerUp,!0)):(window.document.addEventListener("mousemove",this.onPointerMove,!0),this.interactionDOMElement.addEventListener("mousedown",this.onPointerDown,!0),this.interactionDOMElement.addEventListener("mouseout",this.onPointerOut,!0),this.interactionDOMElement.addEventListener("mouseover",this.onPointerOver,!0),window.addEventListener("mouseup",this.onPointerUp,!0)),this.supportsTouchEvents&&(this.interactionDOMElement.addEventListener("touchstart",this.onPointerDown,!0),this.interactionDOMElement.addEventListener("touchcancel",this.onPointerCancel,!0),this.interactionDOMElement.addEventListener("touchend",this.onPointerUp,!0),this.interactionDOMElement.addEventListener("touchmove",this.onPointerMove,!0)),this.eventsAdded=!0)}},{key:"removeEvents",value:function(){this.interactionDOMElement&&(this.emit("removeevents"),this.interactionDOMElement.removeEventListener("click",this.onClick,!0),window.navigator.msPointerEnabled?(this.interactionDOMElement.style["-ms-content-zooming"]="",this.interactionDOMElement.style["-ms-touch-action"]=""):this.supportsPointerEvents&&(this.interactionDOMElement.style["touch-action"]=""),this.supportsPointerEvents?(window.document.removeEventListener("pointermove",this.onPointerMove,!0),this.interactionDOMElement.removeEventListener("pointerdown",this.onPointerDown,!0),this.interactionDOMElement.removeEventListener("pointerleave",this.onPointerOut,!0),this.interactionDOMElement.removeEventListener("pointerover",this.onPointerOver,!0),window.removeEventListener("pointercancel",this.onPointerCancel,!0),window.removeEventListener("pointerup",this.onPointerUp,!0)):(window.document.removeEventListener("mousemove",this.onPointerMove,!0),this.interactionDOMElement.removeEventListener("mousedown",this.onPointerDown,!0),this.interactionDOMElement.removeEventListener("mouseout",this.onPointerOut,!0),this.interactionDOMElement.removeEventListener("mouseover",this.onPointerOver,!0),window.removeEventListener("mouseup",this.onPointerUp,!0)),this.supportsTouchEvents&&(this.interactionDOMElement.removeEventListener("touchstart",this.onPointerDown,!0),this.interactionDOMElement.removeEventListener("touchcancel",this.onPointerCancel,!0),this.interactionDOMElement.removeEventListener("touchend",this.onPointerUp,!0),this.interactionDOMElement.removeEventListener("touchmove",this.onPointerMove,!0)),this.interactionDOMElement=null,this.eventsAdded=!1)}},{key:"update",value:function(t){var e=t.snippet;if(this._deltaTime+=e,!(this._deltaTime<this.interactionFrequency)&&(this._deltaTime=0,this.interactionDOMElement))if(this.didMove)this.didMove=!1;else{for(var n in th$$