How solar eclipse can be seen with a pinhole?

Answer 1

It is extremely dangerous to look directly at a solar eclipse without proper eye protection, such as welder's goggles or a good solar filter.

However, it is safe to look INDIRECTLY at a solar eclipse, or at sunspots.

One indirect way of looking at the Sun is to poke a hole in a sheet of paper. Hold the sheet of paper in the sunlight, and place another sheet of plain white paper so that the sunlight goes through the hole and onto the white paper. An image of the Sun will appear on the white paper, and you can view the progress of the eclipse safely.

This uses the same principle as the Roman "camera obscura" or "dark room", in which a completely dark room with a single tiny hole in one outside wall would cause an inverted image of the outside to be projected onto a wall of the "camera obscura".

Answer 2

A pinhole camera works by creating a small aperture that allows light to pass through and project an inverted image of the solar eclipse onto a surface, such as a piece of paper. The pinhole acts as a lens to focus the light, allowing the image to be better defined. This technique is a safe way to indirectly view the eclipse without looking directly at the sun.