nature of light experiment

1. Equipment preparation: flat mirror, foldable light screen, laser pointer, protractor, white paper, pencil, etc. 2. Assembling the equipment: Place the flat mirror on the horizontal table, lay the white paper flat on the flat mirror, and draw a straight line along the edge of the flat mirror on the white paper with a pencil to represent the position of the flat mirror. Then mark the incident point O on this straight line. 3. Exploring the relationship between the reflected light, the incident light, and the normal: - Using a laser pointer to stick close to the white paper and shoot it at the O point on the flat mirror at a certain angle, this was the incident light, and the path of the incident light was traced on the white paper. - One could see the reflection of light coming out from the mirror, and the path of the reflection was also drawn on the white paper. - The normal line of the plane mirror is taken through the incident point O (indicated by a dotted line). - Observing, he found that the reflected light and the incident light were on both sides of the normal. 4. Exploring the relationship between the reflection angle and the incident angle: - Use a protractor to measure the reflection angle and the incident angle and record them. - He changed the angle of incidence, such as making it larger or smaller. Then, he used the laser pen to shoot light again, traced the path of the reflected light, measured the reflection angle and the angle of incidence, and recorded it. - After many experiments, it was found that the reflection angle was equal to the incident angle. 5. Investigate whether the reflected light, the incident light, and the normal line are in the same plane: - He turned half of the light screen back to see if he could still see the reflected light. - When the light screen was turned, the reflected light could not be seen. This meant that the reflected light, the incident light, and the normal were in the same plane. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

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The following is a small experiment on the reflection and refraction of light on the surface of the water: [Experiment Materials: A large container (such as a basin), water, and a laser pointer.] ** Experimental Steps **: 1. He placed the container on a horizontal table and poured an appropriate amount of water into the container. 2. He turned on the laser pointer and shot the laser beam at the water surface at a certain angle. 3. Observing the phenomenon on the surface of the water, one could see that a portion of the light was reflected back. Changing the angle of observation, one could find that the reflected light followed the law of reflection, which meant that the reflected light and the incident light were on both sides of the normal, and the reflection angle was equal to the incident angle. 4. At the same time, some of the light entered the water and changed its direction of transmission. This was the phenomenon of light refraction. It can be found that the refracted light and the incident light are on both sides of the normal, and because the speed of light transmission in air and water is different, the refraction angle is not equal to the incident angle. Through this small experiment, one could directly observe the phenomenon of light reflection and refraction on the water surface. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>