What does "upright" mean in geometric optics?

[samy4408]

if someone want to explain to me what is an upright image ? , and what are the other adjectives to define an image in geometric optics and their meaning , Thanks .

 

[DaveC426913]

A quick Google will straighten that out for you.

Hint: the opposite of 'upright' is 'inverted'.

 

[sophiecentaur]

A quick Google will straighten that out for you.

Hint: the opposite of 'upright' is 'inverted'.

Also ‘laterally inverted’ is a good description in many circumstances. All three terms are probably easier to recognise than to describe.