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| Experimental components |
Laser emitter, protractor, reflective mirror surface |
| Experimental process | (1) As shown in Figure ①, let a beam of light be emitted from the protractor at a certain angle to point O. After being emitted through the mirror surface in the middle of the protractor, the light beam is emitted in another direction. Observe the propagation trajectory of the incident light beam EO and the reflected light beam OF, and observe the positions of EO and OF relative to the normal line NO. Read the incident angle and reflection angle of the protractor and record them. (2) Change the incident angle of the laser beam, repeat the content of step (1), record the propagation trajectory of the light beam, observe the positions of EO and OF relative to NO, read the incident angle and reflection angle of the protractor, and record them. (3) As shown in Figure ②, fold the protractor backwards, repeat the content of step (1), and observe whether you can still see the reflected light. |
| Experimental phenomena | When the protractor is folded backwards, no reflected light can be seen in the NOF area of the protractor. |
| Experimental conclusion | When a beam of light is reflected by a mirror surface, the incident light beam and reflected light beam are on both sides of the normal line, and the value of the reflection angle is equal to that of the incident angle. |
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