# Reflection and refraction

Seismic Refraction Versus Reflection Introduction The difference between seismic refraction and seismic reflection is never obvious to the non geophysicist, and rarely explained in simple terms by geophysicists. Due to the similarity of the names, many non geophysicists assume that the terms are interchangeable, or are unaware that there are critical differences between the two techniques that may make one vastly preferred or the other completely unusable given site specific conditions or project goals. General Seismic Principles Seismic techniques generally involve measuring the travel time of certain types of seismic energy from surficial shots i. In the subsurface, seismic energy travels in waves that spread out as hemispherical wavefronts i. Mirrors Video transcript In this video we're going to try to learn a little bit about reflection. Or I guess you could say we are going to reflect on reflection.

I think most of us have a sense of what this is, but we'll try to get a little bit more exact about it. So there are actually two types of reflection, and everything that reflects is doing one or the other, or something in between.

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So we have two types. Let me draw them. So the first type, and this is kind of what we normally associate with reflection is specular reflection.

And in specular reflection, let's say that this is the top of a mirror. This is the surface of a mirror. If I have a light ray coming in-- So let me draw a light ray coming in. And just to get the terminology right, this light ray coming in, this ray, is the incident ray.

And it's the incident ray because it's the ray as Reflection and refraction approaches the reflective surface. Let me write that down.

That right there is the incident ray. It'll approach the surface. And you can almost imagine that it bounces off at essentially the same angle, but in the other direction. So then it'll hit the surface, and then it'll bounce off, and it'll go just like that.

And then we would call this the reflected ray, after it is kind of bounced off of the surface. And you may have already noticed this if you've played around a lot with mirrors you would see-- and we're going to look at some images. So you can think about it a little better.

Next time you're in front of the bathroom mirror you can think about this, and think about the angle of incidence and the angle of reflection.

But they're actually equal. So let me define them right here. So if I were to just drop a straight line that is at a 90 degree, or that is perpendicular to the surface of the actual mirror right over here, we would define this, right here, as the angle of incidence.

I'll just use theta. That's just a fancy letter to show that the angle at which we're coming in, the angle between this ray and the vertical right there, that's the angle of incidence.

And then the angle between that vertical and the blue ray right there, we call that the angle of reflection. And it's just a property of especially mirrors when you're having specular reflection.

And you can see this for yourself at all the regular mirrors that you might experience is that the angle of incidence is equal to the angle of reflection.

## Latest Illustrations

And actually we could see that in a couple of images over here. So let me show you some images of specular reflection, just to make it clear here. So you have some light from the sun hitting this mountain.

And we're going to talk about diffuse reflection in a little bit, and that's what's happening. It's being reflected diffusely. That's why we don't see the actual image of the sun here. We just see the white.LIGHT – REFLECTION AND REFRACTION 81 9.

Magnification produced by a rear view mirror fitted in vehicles (a) is less than one (b) is more than one (c) is equal to one (d) can be more than or less than one depending upon the position. OPTICS Optic is one of the branch of physics which deals with the light and properties of it.

We know that light shows both the particle and wave characteristics. However, in this unit we will learn the particle characteristics of the light. Some of the topics will be covered in this unit are; reflection and refraction of light, plane mirrors, concave and convex mirrors, reflection of light. Light is a complex phenomena. It exhibits both wave *-like and particle-like benjaminpohle.com exact nature is not fully understood and this complexity makes it difficult for one model to describe all of light’s properties.

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A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that [ ]. Science Enhanced Scope and Sequence – Grade 6 Virginia Department of Education © 2 When the sun is low in the sky, sunlight travels through a much greater.

Light waves can be bent and reflected to form new and sometimes altered images. Understanding how light rays can be manipulated allows us to create better contact lenses, fiber optic cables, and high powered telescopes.

Light Refraction