Reflection is enhanced in metals by suppression of wave propagation beyond their skin depths. Ī mirror provides the most common model for specular light reflection, and typically consists of a glass sheet with a metallic coating where the significant reflection occurs. In specular reflection the phase of the reflected waves depends on the choice of the origin of coordinates, but the relative phase between s and p (TE and TM) polarizations is fixed by the properties of the media and of the interface between them. Reflection of light is either specular (mirror-like) or diffuse (retaining the energy, but losing the image) depending on the nature of the interface. Even hard X-rays and gamma rays can be reflected at shallow angles with special "grazing" mirrors. Reflection of VHF and higher frequencies is important for radio transmission and for radar. Reflection is observed with many types of electromagnetic wave, besides visible light. Reflection is observed with surface waves in bodies of water. In geology, it is important in the study of seismic waves. In acoustics, reflection causes echoes and is used in sonar. The law of reflection says that for specular reflection (for example at a mirror) the angle at which the wave is incident on the surface equals the angle at which it is reflected. Common examples include the reflection of light, sound and water waves. Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Waves in general can do all of the above.The reflection of Mount Hood in Mirror Lake. How much gets through the substance? How much gets reflected,Īnd how much gets absorbed? And as I mentioned, it's not just light waves that do this. In fact, when people makeįancy computer graphics, they actually try to doĮxactly what the light would do in the real world to makeĪn image for your eyes that look like the real world. That we see in the lake, it looks almost asīright as the real thing. And then, as we talked about, it looks like a good bit is reflecting. If this was a really deep lake, when you get to the bottom, Some of it is getting absorbed as it makes its way through the water. Probably making it through and probably refracting as it does so. Water right over here, some of the light is Light gets reflected, which we can see right over there. ![]() Of it is getting absorbed, but a little bit of the Part of the mountain, it might be trees, it mightīe rock, it might be dirt, is absorbing more of the light, but it's still reflecting some. Where we see the trees, the same light from the sky is hitting it, but not as much light isĬoming back to our eye, and that's because this Need to look at the sky, is that it's reflecting most of the light. That bright color, in fact, you might need sunglasses This lake right over here is the snow reflects it inĪll different directions, but the fact that it's Now, the reason why weĭon't see a reflection the way that we see in Reflected off of the clouds, or maybe it's getting through the clouds, and when it hits that For example, when we lookĪt this white snow up here, this is reflecting pretty well. Now, the reality in the real world is we have oftentimes a little bit of all of the above happening. And so that would beĪ situation like this. ![]() Material doesn't reflect any, it doesn't transmit any through it, if it's completely absorbing. That, light is coming in, it hits that other material, and then if it bounces That's coming from here, they see it as coming from over here, because it is bounced off. It is bouncing off of it, and then coming to an observer'sĮyeball right over here, and so they see the light And the reason why weĬan see the reflection of the mountains and the lake here is because light that isĬoming from this mountain is hitting the lake and then We can see a reflection of the mountains in the lake right over here. Now you probably have a sense of what happens with reflection. That light can also do, and that's the focus of this video, reflection and absorption. We enter the material, and then we have more And we talk about that in another video, and we call that refraction. And as it goes to that boundaryįrom one medium to another, its direction can change. One medium to another, that the light can go through a medium. But focusing on light for a second, we've already talked about how, if we go from one medium to another, if we're transmitting from With different media, but what I'm talking about can Now, we're gonna talkĪbout the different ways that light can interact Overlooking this Alpine Lake, because there's a lot You this beautiful picture of snow-capped mountains
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