“探究凸透镜成像规律”是初中光学部分的重难点,实验室原来的光具座器材有这样几个不足之处:1.点燃的蜡烛长时间燃烧会污染室内的空气,使实验室内的学生感到不舒服,划燃火柴点燃蜡烛时会产生刺鼻的有毒气体,吹灭后的蜡烛也会产生长长的白烟,这些物质会对学生的身体造成一定的伤害,如果操作不当还有引起火灾的安全隐患。2.在探究成像规律的时候,飘忽不定的烛焰在光屏上的像也很不稳定,清晰度受到很大的影响。由于不是很清晰,因此所成的像不容易判定倒正。光屏上 “Exploring the law of convex lens imaging ” is a heavy difficulty in the optical part of junior high school, the original optical bench instrument has several deficiencies: 1.Light burning candle will pollute the indoor air for a long time, so that the laboratory Of students feel uncomfortable burning a matchstick lit candles will produce pungent toxic gases, the candles will be blown out after the birth of long white smoke, these substances will cause some damage to the students’ health, if not properly handled Have a safety hazard that caused a fire. 2. In exploring the law of imaging, erratic candle flame on the screen is also very unstable, sharpness is greatly affected. Since it is not very clear, the resulting image is not easy to judge. Light screen