3/29/2023 0 Comments Concave angle of reflection calc![]() We find that just as for light ray A, this angle is 45 degrees. We can now measure the angle of incidence between light ray B and this normal. ![]() We’ll then add in the normal at this point. So we’ll begin by extending light ray B up until it meets the surface. ![]() The process is going to be exactly the same. This second part of the question is asking us to do the same thing we just did for light ray A but this time for the light ray labeled B. Which of the points would the light ray B pass through? Okay, now let’s look at the second part of the question. So our answer to this first part of the question is that the light ray A will pass through point F. Extending this reflected ray shows that it passes through the point labeled F. Once we have measured the angle, we can then draw in the path of the reflected ray. This means that to find the direction that the light ray A gets reflected in, we need to measure this same angle 45 degrees on the opposite side of the normal. The law of reflection then tells us that the angle of reflection will be equal to this angle of incidence. In this case, if we measure the angle of incidence, we find that it’s equal to 45 degrees. The angle of incidence □ □ is then the angle between the incident ray and the normal. So let’s add in the normal to the surface at the point where the light ray A meets it. But first, we’re going to need to work out the angle of incidence. And to find this, we can use the law of reflection. We want to work out the angle that this ray gets reflected at. So extending light ray A, we find that it meets the surface at this point here. We can recall that in the absence of anything in its way, a light ray travels in a straight line. We’ll start by extending the light ray A up until the point where it meets the surface. We can use this information to work out what happens to the light ray A in the question. For an angle of incidence □ □ and an angle of reflection □ □, the law of reflection says that □ □ is equal to □ □. The law of reflection tells us that whenever a light ray gets reflected in this way, the angle of incidence must equal the angle of reflection. We’ll label this angle of reflection as □ □. When the light ray gets reflected from the surface, this reflected ray makes an angle with the normal that’s called the angle of reflection. We’ll label this angle of incidence as □ □. We can define the angle of incidence of this light ray as the angle between the ray and the normal to the surface. Now, let’s suppose that we have a ray of light coming in like this. This dashed line is referred to as the normal to the surface. That is, it meets it at an angle of 90 degrees. At any point on that surface, we can draw a dashed line which is perpendicular to it. Let’s suppose that we have some even surface like this. In order to answer this question, we need to recall what happens when a light ray gets reflected. Sure enough, looking at the diagram, we see that the surface is indeed even. The question tells us that we have specular reflection, which means the light rays are reflecting from an even surface. Our task is to work out which of these three points, D, E, and F, the light ray A will pass through after it gets reflected from the surface. And in this first part of the question, we are asked to consider the ray labeled A. This question shows us a diagram containing three light rays. Which of the points would the light ray A pass through? The diagram shows three points D, E, and F that the three light rays A, B, and C might possibly pass through after being reflected. Specular reflection involves light rays reflecting from an even surface as shown in the diagram.
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