Have you taken a picture before and it turns out so bright that you can't see a thing? Or in other cases, it appears dim? It is due to poor exposure of the lens or film to light rays.
The lens of a camera is the central part that opens for light from an object to come through.
That stuff the (Analogue) camera men wind when snapping is not just focusing; he also controls exposure too. However, digital cameras has automatic exposure control.
The radius of the lens opened during a shot and how long the lens was opened, influences the quality of the picture produced.
-Dark Scene Imaging
Now for taking pictures of dark scenes, the lens needs to open wide and stay opened for a long time to allow much light rays from the object, to come into the 'dark image room' in the camera.
-Sports Image Scenes
For sports and fast motion imaging, the aperture, opens and closes at an incredible fast rate, this makes the picture free from motion blurs but they usually come in with low quality.
eg. Biking, running, jumping pics, etc
-Bright Scene Imaging
In bright scenes, the exposure time is low and the radius of opening is very small too inorder to allow a controlled quantity of light come in.
DID YOU KNOW?
All these cases of imaging occurs in the human eyes; infact, they are modelled from the way the human eyes react to light rays.
In the dark, your eye lens opens up automatically to enable you form images in the dark.
The above situation is the explanation for the pains your eyes gives you when you come out from a dark room into a bright environment- yes, the exposure is reducing as your eye muscles contract swiftly.
This is physics in you!
Hope you learnt something new? Any question?
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