Question

The figure shows three opaque strips with very small holes of different shapes. Will the image of the sun obtained on the screen through these three holes be the same or different?

Answer 1

A small circular image of the sun will be obtained in all three cases irrespective of the shape of the hole because the holes will act as a pinhole camera. A pinhole camera is a special kind of camera having a pinhole-sized opening to focus all light rays within the smallest possible area to obtain an inverted image as clear as possible.