Question

Why in pinhole camera the pictures are visible up side done

Answer 1

in a pinhole camera, the images formed are always upside down because a real image is formed on the screen of the camera and a real image can never be erect.

Answer 2

After light passes through small hole, it continues going straight, thus inverting the image. The funny thing is that our eyes work exactly the same way, and image on the retina of the eye is inverted after passing though the eye lens, but our brain turns is upside down for us.