why is the image formed by a pinhole camera upside down?

Question

Physics homework... :(

Answer 1

Think in terms of ray tracing. Light travels in a straight line in a pinhole camera because there is no refracting or reflecting optical element to change the path of the rays of light. The bottom of the film is on the line passing through the pinhole and top of the object. Since all light must pass through the pinhole, that means the top of the object exposes the bottom of the film.

Answer 2

A pinhole digital camera works on an concern-free concept. think of you're interior an excellent, darkish, room-sized container containing a pinhole. think of that exterior the room is a chum with a flashlight, and he's shining the flashlight at different angles for the period of the pinhole. once you look on the wall opposite the pinhole, what you will see is a small dot created by way of the flashlight's beam shining for the period of the pinhole. The small dot will flow as your buddy strikes his flashlight. The smaller the pinhole (interior limits), the smaller and sharper the factor of light that the flashlight creates. Now think of which you're taking your super, darkish, pinhole-geared up room exterior and you factor it at a advantageous panorama scene. once you look on the wall opposite the pinhole, what you will see is an inverted and reversed image of the scene exterior. each and each factor interior the scene emits gentle, and, merely like the flashlight, the beam of light from that factor passes for the period of the pinhole and creates a factor of light on the lower back wall. each and all the factors interior the scene try this on a similar time, so an entire image, in concentration, is created on the lower back wall of the room. the image is extremely dim using fact the pinhole is so small, yet you could discover it if the room is extremely darkish.

Answer 3

The idea of a pinhole camera is to minimalize the light entering the camera obscura, so that only a small amount of light from each point, following only one point, reaches the screen/photosensitive paper. The most direct straight path from the furthest corner of the camera's veiwing range tp tje camera is through the pinhole at a diagonal.