In this video we’re gonna look at some concave mirrors, so when we’re talking about a concave mirror we’re talking about a mirror, that is, in theory, spherical corset. It’S not a told sphere. We’Ve got edge of our mirrors here in here, and I’ve got a radius or circle which should be half the diameter, and that, of course takes us to our Center.
Now half of the centreline takes us to our focal point and these points are important as we draw our ray diagrams. So let’s take a look on a ray that comes in traveling. Parallel to the principal axis is going to reflect off our concave mirror and then go through the focal point, even something that goes off.
The principal ox axis will go back on itself, so we’ve really got three rays. We’Re gonna have to talk about here. So the one we just talked about is something that goes parallel to the principal axis and reflects back through the focal point.
Second ray we’re gonna talk about passes through the top of a reject and then see and reflects back on itself now picture again. This is like within a circle, so, if I went through the center of the circle in Ray would bounce back upon itself and the last one we’re going to talk about passes through F and then reflects parallel to our access principal axis.
Again, if you see the dotted line there, that would be the that’s our Ray, reflecting back into the virtual universe. Now we actually have five different scenarios: five different outcomes for these types of mirrors, our first one is: we put our object beyond the center point.
So what we’ll do is we’ll draw a three rays now, so this one comes parallel to the axis through the focal point, our second one through the focal point and then comes out parallel to the axis and we’d actually do have our meeting point there over two Lines which represents our image farms, but if we also draw the one through the center line, we’ll also end up with our image being there.
So if we had to describe the properties of our image, our image would be smaller than our original one. Of course, that’s the original, it’s inverted and clearly see it’s upside down, it’s closer to the mirror than our object was and it’s forming in the real universe.
So it’s a real image. So next scenario we are at sea, so we run our line. This one goes through the focal point next run. I remember our line goes through the top of the object in Centrepointe, so this one runs up and down and then our third line, we kind of missed the focal point there, but we still end up right below and that’s the point.
These objects at C actually end up being inverted, though the same-sized inverted they are the same distance and also a real image. Let’S take a look at our third scenario: we’ve placed our object between C and F, our first line that goes to the focal point.
Next, one that goes through the center point and our third line that goes there now and it’s all of our three lines of kind of missed here, so we’ll just kind of put our image in as an average of them, and it probably has more to do With my diagram, this needs to be specifically measured out, and it’s not it’s hard to be accurate using this video format here so anyway, we’ll talk about our images here, we’ve got, our image is much larger.
It’S inverted it’s much further away than our object was, and it is a real image. Next, one we’re at the focal point now. This is a strange case here. We’Ve got our first line coming in, we’ve got our second line.
Now those two lines are not meeting and in fact our third line runs up and down. So the three lines at no point will ever gonna meet, so it means, if you’re putting your object at the focal point. You actually end up with no image.
So it’s like you’re standing in front of a mirror and you see absolutely nothing our last one here is between the focal point and the mirror. Again, we run our lines now this one we’re gonna have to dot back.
That’S probably already telling you where our image is going to appear. It’S gonna appear right there over there in the virtual universe and there’s our virtual image. So our image is larger. It’S up right further, along and virtual again, if you measured, you would measure your distance from here to here and then compare it from there to there, and you realize that yet is further away than our original object.
Now we’re going to do another video here there will be a part two and it’ll show some of the calculations using the mirror equation and the magnification equation.