Question

1. camera obscura

a. the camera obscura was an early form of a camera.
b. it used a small hole to project an image onto a surface inside a
type answer here
.
c. this concept was first realized by the philosopher mozi.

Explanation:

The question asks for the missing term in the description of camera obscura. A camera obscura projects an image onto a surface inside a darkened, enclosed space/room, which is a key part of its structure.

Answer:

darkened enclosure (or dark room/box)