The camera works by allowing reflected or produced (for self illuminated bodies) lights rays from a body to pass through its lens and cast an image of itself on a screen behind the lens.
For the fish in the image above, the lights rays from it is the one reflected from another light source, e.g. the sun.
Hence, for all those who love photography and video covering, try not to face the camera lens to the light source - You will get a poor image.To get a the best quality image, the camera lens should be in the same direction with the light rays from the source. And the captured body should obstruct the light source in front of the camera lens. This will make the body to reflect as much light as possible into the camera lens, producing a more detailed picture of the body.
This is the principle used in studio photography to give you those excellent high quality photos.
It's Physics in play all the way.
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