[err:数据源标签'PE.DataSource id="cone" datasource="资料_内容页" itemId="122110" xslt="true" '返回数据错,原因:名称中不能包含“)”字符(十六进制值 0xFF09)。 行 21,位置 294。,源码:1221103 <meta http-equiv="refresh" content="0;url=/Item/122109.aspx" /> /Item/122109.aspx <meta http-equiv="refresh" content="0;url=/Item/122109.aspx" /> 1391(寒假每天一练)2019-2020学年人教版八年级物理:第09天 光的折射 光的色散(附解析)2.79MB2.79Bdocczwlzx吴晓娟czwlzx/UploadFiles/UserPic/UserAvatars/15219_150_150.jpg <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?id=122110"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=dayhits&id=122110"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=weekhits&id=122110"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=monthhits&id=122110"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetBrowseTimes.aspx?id=122110"></script> <img src="/images/star5.jpg" /> 吴晓娟 0 (寒假每天一练)2019-2020学年人教版八年级物理,光的折射,光的色散2020年01月08日/UploadFiles/nopic.gif 中考频度:★★★★★难易程度:★★☆☆☆观察如图所示的漫画,下列说法不正确的是A.人看到的“水底”比中考频度:★★★★★难易程度:★★☆☆☆观察如图所示的漫画,下列说法不正确的是A.人看到的“水底”比实际的水底浅B.人看到的“水底”是虚像C.人能看到水底是因为光线从空气射向水中D.人产生了错误的判断是由于光的折射导致【参考答案】C【知识补给】光的折射1.折射:光从一种介质斜射入另一种介质时,传播方向发生偏折,这种现象叫做光的折射。当发生折射现象时,一定也发生了反射现象。当光线垂直射向两种物质的界面时,传播方向不变。2.光的折射规律:在折射现象中,折射光线、入射光线和法线都在同一个平面内;光从空气斜射入水中或其他介质中时,折射光线向法线方向偏折(折射角<入射角);光从水或其他介质中斜射入空气中时,折射 【内容简介】中考频度:★★★★★难易程度:★★☆☆☆观察如图所示的漫画,下列说法不正确的是A.人看到的“水底”比实际的水底浅B.人看到的“水底”是虚像C.人能看到水底是因为光线从空气射向水中D.人产生了错误的判断是由于光的折射导致【参考答案】C【知识补给】光的折射1.折射:光从一种介质斜射入另一种介质时,传播方向发生偏折,这种现象叫做光的折射。当发生折射现象时,一定也发生了反射现象。当光线垂直射向两种物质的界面时,传播方向不变。2.光的折射规律:在折射现象中,折射光线、入射光线和法线都在同一个平面内;光从空气斜射入水中或其他介质中时,折射光线向法线方向偏折(折射角<入射角);光从水或其他介质中斜射入空气中时,折射光线向界面方向偏折(折射角>入射角)。在折射现象中,光路是可逆的。在光的折射现象中,入射角增大,折射角也随之增大。在光的折射现象中,介质的密度越小,光速越大,与法线形成的角越大。3.折射的现象:①从岸上向水中看,水好像很浅,沿着看见鱼的方向叉,却叉不到;从水中看岸上的东西,好像变高了。②筷子在水中好像“折”了。③海市蜃楼。④彩虹。 光的色散1.三棱镜把白光分解成红、橙、黄、绿、蓝、靛、紫七种颜色的光的现象叫光的色散。太阳光(即白光)是由多种色光混合而成的。这是英国牛顿发现的。2.彩虹是光的色散现象,海市蜃楼是光的折射现象。3.色光的三原色是指红、绿、蓝。4.物体的颜色:应用:绿光照到一个穿白上衣红裙子的人身上,看见的是绿色上衣,黑色的裙子。(反射与物体颜色相同的色光,不同颜色的就被吸收而成黑色)  学科~网5.看不见的光:是指红光之外的辐射叫红外线和在光谱的紫端以外的看不见的光叫紫外线。红外线的作用:(1)制红外线夜视仪;(2)红外线遥控;(3)红外线烧烤食物;(4)红外线测温度。紫外线的作用:(1)有助于人体合成维生素C;(2)杀死微生物、灭菌;(3)能使荧光物质发光来识别钞票的真伪。中考频度:★★★★★难易程度:★★☆☆☆观察如图所示的漫画,下列说法不正确的是A.人看到的“水底”比实际的水底浅B.人看到的“水底”是虚像C.人能看到水 <p><em>所属专辑:</em> <a href='/Special_192/Index.aspx' target='_blank'> (寒假每天一练)2019-2020学年人教版八年级物理寒假作业(附解析) </a> </p> 下载地址1|sj/2020/1/202018121327.doc<table width="100"><tbody><tr class="firstRow"><td width="57" valign="top" style="padding: 0px 7px;"><p style="line-height:150%;vertical-align:middle"><strong><span style=";line-height:150%;font-family:宋体;color:#41A54D">中考频度:</span></strong><strong><span style=";line-height:150%;font-family:宋体;color:#41A54D">★★★★★</span></strong></p></td><td width="42" valign="top" style="padding: 0px 7px;"><p style="line-height:150%;vertical-align:middle"><strong><span style=";line-height:150%;font-family:宋体;color:#41A54D">难易程度:</span></strong><strong><span style=";line-height:150%;font-family:宋体;color:#41A54D">★★☆☆☆</span></strong></p></td></tr></tbody></table><p style="line-height: 180%;vertical-align: middle"><strong><span style=";line-height:180%;font-family:'Times New Roman','serif';color:red"><img width="104" height="40" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /></span></strong></p><p style="line-height: 150%;vertical-align: middle"><span style="font-family:宋体">观察如图所示的漫画,下列说法不正确的是</span></p><p style="text-align:center;line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'"><img width="385" height="112" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></p><p style="line-height: 150%;vertical-align: middle"><span style="font-family:'Times New Roman','serif'">A</span><span style="font-family:宋体">.人看到的</span><span style="font-family:'Times New Roman','serif'">“</span><span style="font-family:宋体">水底</span><span style="font-family:'Times New Roman','serif'">”</span><span style="font-family:宋体">比实际的水底浅</span></p><p style="line-height: 150%;vertical-align: middle"><span style="font-family:'Times New Roman','serif'">B</span><span style="font-family:宋体">.人看到的</span><span style="font-family:'Times New Roman','serif'">“</span><span style="font-family:宋体">水底</span><span style="font-family:'Times New Roman','serif'">”</span><span style="font-family:宋体">是虚像</span></p><p style="line-height: 150%;vertical-align: middle"><span style="font-family:'Times New Roman','serif'">C</span><span style="font-family:宋体">.人能看到水底是因为光线从空气射向水中</span></p><p style="line-height: 150%;vertical-align: middle"><span style="font-family:'Times New Roman','serif'">D</span><span style="font-family:宋体">.人产生了错误的判断是由于光的折射导致</span></p><p style="line-height:150%;vertical-align:middle"><strong><span style=";line-height:150%;font-family:宋体;color:red">【参考答案】</span></strong><span style=";line-height:150%;font-family:'Times New Roman','serif'">C</span></p><p style="line-height: 150%;vertical-align: middle"><strong><span style=";line-height:150%;font-family:'Times New Roman','serif';color:red"><img width="648" height="110" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></strong></p><p style="line-height:150%;vertical-align:middle"><strong><span style=";line-height:150%;font-family:宋体;color:red">【知识补给】</span></strong></p><p style="text-align:center;line-height:150%;vertical-align:middle"><strong><span style="font-size:16px;line-height:150%;font-family:楷体;color:#7030A0">光的折射</span></strong></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'">1</span><span style="font-family:宋体">.</span><span style="font-family:楷体">折射:光从一种介质斜射入另一种介质时,传播方向发生偏折,这种现象叫做光的折射。当发生折射现象时,一定也发生了反射现象。当光线垂直射向两种物质的界面时,传播方向不变。</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'">2</span><span style="font-family:宋体">.</span><span style="font-family:楷体">光的折射规律:在折射现象中,折射光线、入射光线和法线都在同一个平面内;光从空气斜射入水中或其他介质中时,折射光线向法线方向偏折(折射角</span><span style="font-family:'Times New Roman','serif'">&lt;</span><span style="font-family:楷体">入射角);光从水或其他介质中斜射入空气中时,折射光线向界面方向偏折(折射角</span><span style="font-family:'Times New Roman','serif'">&gt;</span><span style="font-family:楷体">入射角)。在折射现象中,光路是可逆的。在光的折射现象中,入射角增大,折射角也随之增大。在光的折射现象中,介质的密度越小,光速越大,与法线形成的角越大。</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'">3</span><span style="font-family:宋体">.</span><span style="font-family:楷体">折射的现象:①从岸上向水中看,水好像很浅,沿着看见鱼的方向叉,却叉不到;从水中看岸上的东西,好像变高了。②筷子在水中好像“折”了。③海市蜃楼。④彩虹。</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'"> </span></p><p style="text-align:center;line-height:150%;vertical-align:middle"><strong><span style="font-size:16px;line-height:150%;font-family:楷体;color:#7030A0">光的色散</span></strong></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'">1</span><span style="font-family:宋体">.</span><span style="font-family:楷体">三棱镜把白光分解成红、橙、黄、绿、蓝、靛、紫七种颜色的光的现象叫光的色散。太阳光(即白光)是由多种色光混合而成的。这是英国牛顿发现的。</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'">2</span><span style="font-family:宋体">.</span><span style="font-family:楷体">彩虹是光的色散现象,海市蜃楼是光的折射现象。</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'">3</span><span style="font-family:宋体">.</span><span style="font-family:楷体">色光的三原色是指红、绿、蓝。</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'">4</span><span style="font-family:宋体">.</span><span style="font-family:楷体">物体的颜色:应用:绿光照到一个穿白上衣红裙子的人身上,看见的是绿色上衣,黑色的裙子。(反射与物体颜色相同的色光,不同颜色的就被吸收而成黑色)</span><span style="font-family:'Times New Roman','serif'">  </span><span style="font-family:楷体">学科</span><span style="font-family:'Times New Roman','serif'">~</span><span style="font-family:楷体">网</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:'Times New Roman','serif'">5</span><span style="font-family:宋体">.</span><span style="font-family:楷体">看不见的光:是指红光之外的辐射叫红外线和在光谱的紫端以外的看不见的光叫紫外线。</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:楷体">红外线的作用:(</span><span style="font-family:'Times New Roman','serif'">1</span><span style="font-family:楷体">)制红外线夜视仪;(</span><span style="font-family:'Times New Roman','serif'">2</span><span style="font-family:楷体">)红外线遥控;(</span><span style="font-family:'Times New Roman','serif'">3</span><span style="font-family:楷体">)红外线烧烤食物;(</span><span style="font-family:'Times New Roman','serif'">4</span><span style="font-family:楷体">)红外线测温度。</span></p><p style="line-height:150%;vertical-align:middle"><span style="font-family:楷体">紫外线的作用:(</span><span style="font-family:'Times New Roman','serif'">1</span><span style="font-family:楷体">)有助于人体合成维生素</span><span style="font-family:'Times New Roman','serif'">C</span><span style="font-family:楷体">;(</span><span style="font-family:'Times New Roman','serif'">2</span><span style="font-family:楷体">)杀死微生物、灭菌;(</span><span style="font-family:'Times New Roman','serif'">3</span><span style="font-family:楷体">)能使荧光物质发光来识别钞票的真伪。</span></p><p><br /></p>人教版不限试题试卷专供vip会员doc <img src="/images/nopic.gif" alt="%ef%bc%88%e5%af%92%e5%81%87%e6%af%8f%e5%a4%a9%e4%b8%80%e7%bb%83%ef%bc%892019-2020%e5%ad%a6%e5%b9%b4%e4%ba%ba%e6%95%99%e7%89%88%e5%85%ab%e5%b9%b4%e7%ba%a7%e7%89%a9%e7%90%86%ef%bc%9a%e7%ac%ac09%e5%a4%a9+%e5%85%89%e7%9a%84%e6%8a%98%e5%b0%84++%e5%85%89%e7%9a%84%e8%89%b2%e6%95%a3%ef%bc%88%e9%99%84%e8%a7%a3%e6%9e%90%ef%bc%89" border="0" /> 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