invisible
The definition of 'invisible' is "Anything in which the naked human eye cannot see is invisible." Well, that's the definition in most dictionaries. But anything that cannot be seen by your naked eye is either too small or does not have enough or any light reflecting off of it well enough to allow you to see it.
No. Use "you saw something" or "you have seen something," depending on context
The noun measles is a concrete noun; although it can't be seen by the naked eye, the virus can be detected and seen with the use of instruments; measles is a physical thing.
Camouflage means to hide or disguise something so that it cannot be easily seen or found. Animals use camouflage to hide from predators and the military uses it to hide from the enemy.
Authorization is a noun.
a thin film that cannot be seen by the naked eye
Latent fingerprints are the types of fingerprints that aren't visible to the naked eye.
Bacteria cannot be seen with naked eye.They are microscopic organisms.
The atom can't be seen with naked eyes because the size of an atom is beyond our imagination and is lesser than 1/100th of an ant .
That refers to a comet that cannot be seen with the naked eye; only with a telescope.
It is used to see things that cannot be seen with the naked eye
Neptune.Uranus can be seen with the naked eye, but it has to be near perfect conditions and you have to know exactly where to look as it will just look like a dim star.
You cannot see a Blackhole with the naked eye and they're hard to detect anyway. No one would see a Blackhole pull anything into its center.
Atom
Microscopes help to see small objects that cannot be seen by the naked eye.
Microscopes are used to see things that are tiny and cannot be seen by naked eye.
The answer is noise. Noise is a sound that is made by many sources, but it is intangible and cannot be seen with the naked eye.