the front part of any camera is circular but the photo is in rectangle how?
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your eye is round but your vision is somewhat rectangular how ?
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Explanation:
The important thing to understand is that the lens doesn't actually determine the shape of the picture that is produced. With any camera the lens only bends and focuses light onto a screen, which for olden day cameras are objects like films. The shape of the film actually determines the shape of the picture.
The lens in a camera is very similar to the human eye. The eye is circular and yet you don't see everything in a circular picture. Lenses can be different shapes like rectangles (as you mentioned) but these shapes are not as good at focusing light. This is why the eye, magnifying glasses and various other objects are round rather than square or rectangular
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