00:01
This is a conceptual question about the passenger side roof your mirror on an automobile that usually has the message joint objects in the mirror are closer than they appear.
00:11
It asks first, is it a virtual real image? well, think about it, the image that you see is upright and smaller.
00:18
And so because it's upright, it has to be a virtual image.
00:21
If it was inverted, it would be real.
00:24
So we know the answer for a is virtual.
00:28
For b, it asks, is the mirror concave or convex? if it was a concave mirror, then the virtual image will be enlarged.
00:41
Because the image is smaller, that tells me that it must be a convex mirror.
00:47
And so that's the answer for letter b.
00:51
For letter c, they ask you to prove that the image must actually be closer than the object.
00:57
If you think about the lens equation, 1 over f equals 1 over p plus 1 over q, assuming that the object distance p is greater than q, we're going to say much, much greater.
01:12
So we're looking at an object that's relatively far away...