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第36章 第一堂课(2 / 2)

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“那么如果有的物体表面能全部波长的可见光都反射出来,会怎样?”

“是白色吗?”有学生小声地嘀咕着。

“对!很对。”方尘肯定,紧接着又抛出了一个问题:“咱们同学穿的风衣上的黑色是怎么来的呢?”

黑衣学生不由得瞪大了眼睛:“黑色?染上的呗。”

方尘笑了笑,说:“按日常生活来看,你答的很对。但按色彩原理来看,你答的就不完全了。黑色这种染料物质不能纯净地反射某种色光,白光照到它上面,所有波长的色光都不能产生同步共振的返回,也就是说都被吸收了,所以呈现黑色。但吸收的光会转化为热量,这就是黑色吸光的现象。”

“请大家进一步思考一下:红、橙、黄、绿、青、蓝、紫这七色充分混合后会得到什么颜色?”

学生们议论纷纷,莫衷一是。

“那就打开你们的颜色,调一调,试试看。”

很快,结果就出来了,是一种黑乎乎的色彩,而且每个人调出的色彩都不一样,但都不是纯粹的黑。

“这七色充分混合后理论上应该得到黑色。但由于以水调色稀释了色素,而且比例都会有些误差,所以调不出真正的黑。”

“大家再用红、黄、蓝,这三种颜色,调一调,看看能出什么颜色。”

“咦,还是那种颜色。”

…………

搬开了“光与色”这个拦路虎,后面的三原色与三间色、复色、色彩三要素、色彩的冷暖与色调,等等,这些色彩知识就好讲了。

下课铃响了。

方尘喝了口水,刚刚放下杯子。

课代表期期艾艾地走过来,有点不好意思地问道:“老师,上学期期末考试的那张画儿什么时候发啊?”

方尘犹豫了一下,问道:“主考老师没发给你们吗?”

美术是考查课,而且是画画儿,不需留卷子,所以判完分后都会发还给学生。

课代表摇摇头:“没发啊,还有之前的两次作业也没发。”

方尘一愣,上学期很突然地让她交画室,当时画室里是有一些没来得及发下去的学生作业,交接时余美芳说让接课的老师负责发。想到这里,忙问:“上学期最后那堂课是谁给你们上的?考试是谁主考的?”

“万芳芳老师,还有陈高峰老师。”课代表说着,目光转向旁边的学生,那学生本就注意地听着,这会儿马上附和着点点头。

方尘头好大!

课后,方尘赶紧去系办公室找余美芳。

一进楼道就听到余美芳张扬肆意的笑声。

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