What is true of extension tubes? they degrade the quality of the image. all of the above are true. they attach to the end of the lens closest to the subject. they are hollow?

All of the above are true of the extension tubes. Extension tubes degrade the quality of images because it makes a greater loss of light to the lens and attach to the end of the lens closest to the subject in order to move the lens farther to the object. They are hollow because they are not made from lenses as an additional lens.

Ithink they do have the same properties just in less quantities i think