Romantic Atmosphere Caused by green laser pointer

According to the law of refraction of light, from his writings on the blackboard to draw two light injection point P, after refraction at the water into people's eyes.
(For ease of description, the introduction of "angle" and "refraction") ⑶ When the incident angle increases or decreases, the angle of refraction change? ⑷ reversible optical refraction it? The purpose of the experiment can be summarized into a brief text, multimedia cast out, and allow students to watch the 1 minute. Figure 3.4-3 Student clear intent of the experiment, put the "initiative" completely up to the students, some of the activities to give students sufficient time to allow them to experiment, observe, discover, exchange, open to exploration. The directing length of green laser pointer is very long.Activities, the class focused on the exchange, the students report their findings, teachers timely review and guide. Students experienced the process of experimental inquiry, most of them can find the initial law of light refraction; individual students some of the inaccurate and false conclusions, to guide students to discuss the final refraction of light to obtain a correct understanding of the law; some students found may be beyond the scope of high school physics, such as found in the total reflection phenomenon, teachers should be given praise and encouragement.If you change different laser heads of the green laser pointer you might get light spot in different shapes. Concluded, has been the law of refraction of light: light refraction, the refraction of light, light rays, the normals in the same plane; light refraction, the refraction of light, light rays, the normals in the same plane; refraction of light and incident light are located normal on both sides. Normals are located on both sides. Oblique light from air to water or glass surface, the refraction of light to the normal deflection, angle of refraction less than the angle of incidence. Oblique light from air to water or glass surface, the refraction of light to the normal deflection, angle of refraction less than the angle of incidence. When the incident angle increases, the angle of refraction also increases. Light hitting the water or the vertical surface of the glass surface, when the incident angle increases, the angle of refraction also increases. Light hitting the water or the vertical glass surface, the light propagation direction is not changed. The education area now is unable to do without green laser pointer.Does not change. In the light refraction, the light path is reversible. In the light refraction, the light path is reversible. To help students understand and consolidate the law of refraction of light, allowing students to make some light road map. Figure 3.4-4 shows the approximate location of the light to reflect. Figure 3.4-4 reflects the phenomenon of life in the use of the law of refraction of light refraction to explain the phenomenon of life, is more difficult for middle school students, teachers should attract attention. Because students do not learn the principles of plane mirror imaging of the human visual habits is not clear; combined to explore the laws of light refraction when taking up more classroom time, so for the "upward bending pencil Why," while drawing teacher recommended edge point of pulling, teachers and students of bilateral discussions, which allow students to find out the truth, the students in understanding the basis of analogy, an independent analysis of other similar phenomena.The business area is now unable to do without green laser pointer. If the explanation "why the pencil upward bending", the first clear: people see a pencil, pencil emitted from the light into his eyes.