Question

what principle is the pinhole camera based on​

Answer 1

Answer:

Principle of Pinhole Camera

The image formed by the camera shows the rectilinear propagation of light, which means the pinhole cameras rely on the fact that light travels in a straight line.

Answer 2

Rectilinear theory of light

Pinhole cameras rely on the fact that light travels in straight lines – a principle called the rectilinear theory of light. This makes the image appear upside down in the camera .

OR

A pinhole camera is a simple optical device which works on the principle of light travelling in the straight line .

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