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so this video is all about ray diagrams so lets start with a spherical mirror particularly a concave mirror lets draw a horizontal line now this horizontal line is known as the principal axis and lets say this is the focal point the distance between the focal point and the mirror is known as the focal length and lets place the object outside of the focal point so lets put it there and so the distance between the object and the mirror thats d-o h-o is the height of the object so lets draw a ray from the object to the mirror i think i went too far lets do that again and then from the mirror lets draw a line to the focal point now lets draw another ray from the object through the focal point to the mirror and then its going to bounce back and go in this direction so where the rays intersect that is the location of the image and so what type of image do we have would you say this is a real image or a virtual image now because the light rays actually converge at this point we ha