Actually yes, DNA can be seen, and is a physical entity. As far as seeing it with my OWN eyes, I don't own the equipment (I wish I did) but others can produce differing images for me if I requested the results of a DNA test from this hypothetical piece of bone. DNA is entirely proveable based upon images, facts and tests (which should be repeated so results can be replicated). Replication of results is important in any study, test, theory or hypothesis.
You can see various things which can be reliably interpreted as indicators of the DNA structure, but you can't see DNA.
As far as seeing it with my OWN eyes, I don't own the equipment (I wish I did) but others can produce differing images for me if I requested the results of a DNA test from this hypothetical piece of bone.
These are not images of DNA. They are a record of the sizes of various segments of the helix, and the meaning of this record is entirely dependent on a previously established understanding of the existence, structure, and significance of the DNA itself.
The DNA is entirely proveable based upon images, facts and tests (which should be repeated so results can be replicated). Replication of results is important in any study, test, theory or hypothesis.