Sunlight is always falling on the moon and illuminating exactly half of it. That doesn't change.
However, we're usually not in a place where we can see the entire lighted half of the moon.
When we do happen to be in a position to see it all, that's when we call it a "Full Moon".
The light form the moon is sunlight reflected from the moon's surface when sunlight fall onto it. Thus while you are in the Earth's shadow (night time) the moon is not. :)
The half of the moon that faces earth is in full sunlight.
a full moon
That's a "Full Moon".
The sun provides about 400,000 times more light than the full moon. While the full moon can illuminate the night sky and provide some light, it reflects only a small fraction of the sunlight that reaches it. This significant difference in brightness is due to the sun being a massive, luminous star, whereas the moon is a rocky body that reflects sunlight.
One week after the full moon, the moon is in its third quarter phase. During this phase, the left half of the moon appears illuminated when viewed from the Northern Hemisphere, while the right half appears illuminated from the Southern Hemisphere. This is because the sunlight is shining on the opposite side of the moon compared to the full moon phase.
A full moon phase is when the full face of the moon facing earth is a complete disc of reflected sunlight. So, I don't really understand the question that states a full moon can't be seen?
Around 7%.
full moon
The light of the full moon originates from the sun. When the moon is full, it is positioned directly opposite the sun in relation to Earth, allowing sunlight to illuminate its surface. The moon does not produce its own light; instead, it reflects the sunlight that hits it, creating the bright appearance we see from Earth.
When sunlight fall on the moon you DO see shadows, the shadows are produced by the mountains on the moon and are visible wile the sunlight fals at an oblique angle (before and after the full moon). To see the details of the shadows you need to use binoculars or a telescope. You also observe the shadow of the moon in the lunar phases. It is daytime on the side of the moon facing earth when we observe a full moon; it is nighttime on that same side (that always faces the earth) during a new moon. During a lunar eclipse, the earth casts a shadow on the moon.
You can see the entire sun's reflection!!