Question

What is a “camera obscura”?

Answer 1

The first ever camera used by the German astronomer Johannes Kepler in 1604.

Answer 2

A camera obscura is a darkened room with a small hole or lens at one side through which an image is projected onto a wall or table opposite the hole. "Camera obscura" can also refer to analogous constructions such as a box or tent in which an exterior image is projected inside.