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在“光的折射”教学中,根据课程标准的要求,笔者要求学生画出在岸边看到水中鱼的位置。学生依据光的折射规律,画出了看到水中鱼的位置的3种情况,分别是:在鱼的左上面,在鱼的正上方,在鱼的右上方,如图1-a、图1-b、图1-c所示,A点是鱼的实际位置,A_0是看到的鱼的位置。一、第一次实验探究实际上,我们在某一确定的位置看到水中鱼的位置只有一种,不可能出现多种情况,那么到底谁是谁非呢?为此,笔者设计了一个实验进行探究。取一块玻璃砖、一张表面平整的硬白纸板与一支激光笔。把玻璃砖一面与硬白纸板的一面贴在一
In the teaching of “refraction of light”, according to the requirements of the course standard, the author asks the students to draw a picture of the fish in the water on the shore. Students according to the law of refraction of light, drawn to see the location of fish in water three kinds of situations are: the fish in the upper left, right above the fish, fish in the upper right, as shown in Figure 1-a, Figure 1 -b, as shown in Figure 1-c, point A is the actual position of the fish, and A_0 is the position of the seen fish. First, the first experimental exploration In fact, we have a certain place to see the location of fish in the water there is only one, there may not be a variety of circumstances, then who in the end who? To this end, I designed an experiment Explore. Take a glass brick, a flat surface with a hard white cardboard and a laser pointer. Stick one side of the glass brick to the hardboard side