Rays of light coming from the sun a very distant object are...

Rays of light coming from the sun (a very distant object) are near and parallel to the principal axis of a concave mirror. After reflecting from the mirror, where will the rays cross each other at a single point? The rays O will cross at a point beyond the center of curvature will cross at the focal point. O will not cross each other after reflecting from a concave mirror. O will cross at the center of curvature. O will cross at the point where the principal axis intersects the mirror. eTextbook and Media Save for Later Attempts: 0 of 5 used Submit Answer

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00:01 Here we're going to look at imaging by a plain mirror.

00:05 And really the idea is that we can use the law of reflection, which says that the angle of incidence is equal to the angle of reflection.

00:23 And usually those angles are the angles the rays make to the normal to the surface.

00:34 So let's see how this works.

00:36 The idea is an object.

00:38 Is a source of infinite points of light, each of which is emitting in all different directions.

00:47 So here we have a point source in front of a mirror, and i will show a couple rays, and we'll see where the image gets formed by those rays.

01:00 So i will first draw a ray that goes in and hits with normal incidents.

01:07 It's a simple enough ray to draw.

01:09 So that means because it is coming in straight, it is making an angle of zero degrees to the normal.

01:21 And it should make an angle of zero degrees straight back.

01:28 Now, we can't really see where the image forms, what an image is.

01:33 This is a good thing to define what is an image.

01:37 So to make an image, you need to have a point source running into something.

01:54 And in this case, the reflected rays need at a point called the image point.

02:11 And what this does is your brain gets fooled into thinking the object really was at that image point.

02:19 And we can't really find the image with just one ray.

02:24 So we're going to need another one.

02:27 And it doesn't matter which direction we send it in.

02:32 So we'll just send it up to the mirror at ray position 1...

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