The refraction of light is sometimes a little tricky. Sometimes It is used in magic tricks. And It made the trick very magical,but It can be explained by: the refraction of light.
Here is a hypothesis: suspect that you went to a science lecture. The lecture is about light. During the lecture. The teacher said something about the refraction of light. Then, he performs a "magic" trick. You waited to see what magical effect is about to take place. The professor took out two candles and a piece of glass. He put the glass between the two candles. Then, he lit them. He offered an audience to a right angle to the glass and try to blew out two candles at once. He or she can't do it. Then the professor blew out the candles and a changing a little, relit "them". Then he took a deep breath and blew. The "two" candles went out "together"! How amazing!
Then you will wonder: how did he do it? The answer is in here.
Can you identify reflection from reflection? They both had a common thing of changing a direction which light is traveling. If you can't identify them, then see the picture below.
You can see both pictures had a surface, and a stream of light which travelled in a different direction when meeting the surface. Reflection happens when the light traveled through the surface, which means that reflection has the light on both side of the surface. But reflection on the other hand is only on one side of the surface. You'll have to have this knowledge in your head for in the future of our investigation, you will have to use it.
Reflection and refraction is both all around us. But we sometimes didn't notice it. Why? because it is too common a thing for our brains to think about it. We all knew the reflection angle is equal to the incident angle, light travels in a straight line. But can you explain it in a scientific way? No, you can't. Why? Because you didn't study it.
Why do light reflect? We know that the universe and earth has different medium. Which means like a bridge that particles need to travel on. Scientists have discovered when light traveled in homogeneous medium. It travels in a straight line, but if it entered an all homogeneous medium the light will be bend. The different kind of medium will obviously has some affect on the light. The effect was the particle of the medium pushed the light onto another road. Light can't push back, so it'll have to follow the road that the particle of the medium had laid out for it. And for another reason, the light have to suit to the medium is traveling in.
Light have many uses, for example: professional experiments, studies, surgery and having fun. But there was a horrible truth that light was dangerous. You might think it's crazy. But it is a truth. You can't deny it: You go to an outside pool to go swimming on a very summer day. The water is clear as glass. You can see the bottom of the pool. It seems to you to be very shallow. You stepped in. Expecting your foot will land directly on the bottom of the pool, but the bottom is deeper than you expected. Your arm's strength gave way. Your foot slipped on the slippery bottom. You lean back. You hit the back of your head on the edge of the pool and……The next thing you know you're in the hospital or there will never be next thing because you are……
Do you want to know how the professor did magic trick? Now l'm here to explain it. This is a prosess called: equal amount replacement. It is in some way a very simple one, but only works when the watcher is in front.
This trick have some thing to do with reflection and refraction. We will go into that later when we have finished with the law of refraction.
When light travels through a different medium. It can be retracted to anywhere. So we must find out the object's refractivit. Then how to find out? We must calculate.
