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22.自制三棱镜:找一圆筒形状的透明小塑料袋,把清水注入袋内,系紧袋口,用三块条形的玻璃把装水的塑料袋夹成三棱柱形,再用两根橡皮筋将两端捆住,即成三棱镜。让太阳光通过棱镜射到白墙上,你将看到一条按红、橙、黄、绿、蓝、靛、紫顺序排列的彩色光带。23.简易实用的密度计:一支写空油墨的圆珠笔芯,只要在上面用小刀刻上毫米刻度,不再进行任何
22. Self-made prisms: Look for a transparent small plastic bag in the shape of a cylinder, inject clean water into the bag, tighten the mouth of the bag, insert the plastic bag filled with water into three prisms with three strips of glass, and then use two The rubber band binds both ends and forms a prism. Let sunlight pass through the prism and shoot on the white wall. You will see a colored light band arranged in order of red, orange, yellow, green, blue, black and purple. 23. Simple and practical densitometer: A ball-point refill for writing empty ink, as long as the millimeter scale is engraved on it with a knife, no longer any