一个改进的“光的折射”实验及由其展开的教学设计

An Improved Experiment of Light Refraction and Its Expansion of Instructional Design

本课题的教学设计是在人教版初中物理教材关于光的折射部分内容的基础上，以更容易携带且折射率更大、实验现象更明显的PV塑料板代替教材原实验设计中的水缸来得到光的折射的规律．并且可以由不同浓度蔗糖溶液中光线的弯曲模拟海市蜃楼的实验引出新课，吸引学生兴趣．同时设计了供学生自主实验来探究光的折射的规律及光路可逆的课堂部分，有助于理解记忆、激发兴趣、提升学生的综合素质．

The teaching design of this subject is based on the refraction of light in the physics textbook of junior middle school of People＇s Education Press. The PV plastic plate, which is easier to carry and has higher refractive index and more obvious experimental phenomena, and replaces original experimental design in the textbook which using a water tank to get the law of refraction of light. And theconeentrationofdifferent sucrose solution for the simulationof mirage experiment is used to begin a new class to attract students. At the same time, it is designed for students to study the law of refraction of light and the reversible part of the optical path, which is helpful to understand, memorize, stimulate the interest and improve the students＂ comprehensive quality.