Reflection And Refraction Of Light

Introduction

In the learning course of class 12, there are several topics about the light, its reflection, refraction, different lenses and mirrors. To achieve good results in these seemly difficult subjects, at first we need to understand the basics.

In a video form, it is easier to get the information, to understand it, when the theory is told while this theory is showed with examples. I hope that everything will be fine and good luck!

Task

Watch this video abou reflection and refraction of light and later answer to the questions! To get the answers to the questions, you need to watch the video till 20:35, but if you want, of course, you can watch the whole video.

[video:https://www.youtube.com/watch?v=SiSzh3P8PxE]

Process

Answer to these questions:

  1. What is the first law of reflection?
  2. Why cannot you usually see your face in the table?
  3. What is the difference about the irregular and regular reflection?
  4. What are the image properties? What does every of them include?
  5. How is the axe that connects two of a spherical mirror centres called?
  6. What is the refraction of light?
  7. Why does the light bend when it goes from one material to other?
  8. How many definitions of refractive index are there? Which of them is the best?
  9. What is the Snell's law?
  10. In what way does the ray go when it goes from less dense to more dense?

Evaluation

Answers of the questions:

  1. Angle of reflection is always equal to the angle of reflection;
  2. Because the surface is rough and the reflection is irregular;
  3. Rough and smooth surface;
  4. Nature - real or virtual image, type - upright or inverted image, size - magnified, diminished or same size of the image, position - varies;
  5. The principal axes;
  6. The bendinf of light when it passes from one transparent substance to other;
  7. Because of the change in the speed of light;
  8. 4; REfractive index is the racial of speed in air by the spee in the material;
  9. n1sinOi = n2sinOr;
  10. The ray goes towerds the norman.

Conclusion

Congratulations! Hopefully, now you understand the reflection and refraction of light! Now it will be much easier to understand other topics about light, such as the rainbow, the lenses and so on.

To understand this topic even better, I suggest to visit some interactive portals about physics or in your course book.

Credits

The information and the video was taken from www.youtube.com. It is allowed to use this material in the learning process, if it helps.