The principle of photography is to focus light with the aid of refraction so as to burn the light catcher medium.
Medium that has been burned with the right luminous light size will produce an image identical to the light entering the refracting medium (hereinafter referred to as the lens).
To generate the right light intensity to produce the image, used the aid of a measuring instrument in the form of a lightmeter
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More info of this topic would be very nice.
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Thanks @andyartland
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