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of the wavelength of light and the distance to the screen.

In practice, camera obscuras use a lens rather than a pinhole because it makes a larger aperture work which achieves a usable brightness while maintaining focus.

If the image is caught on a transparent screen, it can be viewed from the back so that it is no longer reversed (but still upside-down). Using mirrors, it is possible to project a right-side-up image. The projection can also be displayed

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