It is said to be inverted
When the image hits the retina, it is upside down but our brain automatically converts it so it is flipped to become an upright image.
it is convex
If the angles of the mirrors that you used on periscope are not parallel to each other you would see the image upside down.
An image that is upside down as compared to the object are known as inverted images. Example, the first thing you will notice is that the concave side of the spoon makes your image come upside down. Such an image is called an inverted image.
concave
If you mean during printing and are referring to the projected image, it is upside down if you put the negative in the carrier the wrong way. The image should go upside down in the carrier so that it is projected right side up.
If it's both upside down and reversed from left to right, it would be equivalent to the image rotated 180 degrees.
an enlarged, upside-down virual image.
convex lens
it is upside down in the back of the eye and the brain corrects that.
The inverted or upside-down image is formed on the retina.
The world doesn't seem up side down to us, even through our retinas, because , your brain works to recognize the image and flips around, sends it to the nerves and lets you see wright side up.