00:01
Hello.
00:03
First, using your lens formula, 1 over u plus 1 over v equals 1 over f.
00:09
U is object distance, v is image distance, f is for calling.
00:14
U is given us 8 centimeters, f is given us 4 centimeters, but we don't know v.
00:23
And so we make v the one over view the subject here, which is 1 over 4 minus 1 over 8, which is 1 over 8, i think.
00:39
So if 1 over v is 1 over 8, then v equals 8 cm.
00:48
Magnification then would be equal to image distance of an object distance, which is 1.
00:55
Let us verify this with a way diagram.
01:01
We have our principal axis and the concave mirror.
01:17
The focal length is f.
01:23
Now the object is placed at a distance twice of the focal length...