i just really want to know how camera obscura works
Light travels in straight lines.
Light that illuminates a surface reflects off of it in many directions.
A camera obscura is a surface that blocks light, with a small hole that allows some light to pass onto a screen.
For any point on the entrance side of the camera, there is only one direction for light to go that will pass through the hole of the camera. It will continue in a straight line until it hits the screen of the camera. All other angles from the point are blocked from reaching the screen.
The image of the entrance side is generated because each point hits the screen at a different (corresponding) spot.
All other angles from the point are blocked from reaching the screen.
This is the bit that made it click with me.
whats to explain? https://www.camera-obscura.co.uk/mediaLibrary/images/english/3817.jpg
light radiates out in all directions from all points in a scene.
So block it with a wall. Now light doesnt get to where you want it
So put a pin hole in the wall
The pin hole blocks all lines of light except the ones that came from 1 spot in the scene. so all the light shining on the wall (or film or whatever) only came from 1 spot. and you get an image of the scene projected on the wall.
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I think the easiest way to think of it is this: If you have a few windows in a room, every point of every one those windows is creating a camera obscura effect on the opposite wall - all the light reflected off objects outside is coming through at every point in every window in such a way that it makes an image of those objects on the opposite wall, if you were standing at the window, your eye would be at one of those points exactly, and would make an image so you can see what's outside the window.
But with all the images from all the points of all the windows, it's just bright all over in the room - nothing focuses it. If you block all the windows, and make 1 tiny hole in one of them, only 1 image gets through.
When light shines through something like a window, you're getting light bouncing from every point, in every direction coming through at once. This means the "image," you would see on the opposite wall ends up a blur due to light from all angles overlapping.
A lens (such as in a camera or our eyes) takes all that light from different directions and bends it, focusing it into a single point at the back of our eyes.
A camera obscura does things a bit differently. Instead of focusing that light, it creates a hole that's so small only one "point," of light from each spot in the scene can pass through, resulting in minimal overlapping on the opposite wall, and creating a much clearer image.