WORD I DONT KNOW:Diaphragm-a plate with a hole in the center or a ring that is placed on the axis of an optical instrument, as a camera, and that controls thr amount of light entering the instrument.
Visible spectrum-the range of wavelengths of electromagneticradiation taht is normally visiblefrom 380 to 760 nm
Camera obscura-a darkened boxlike device in which images of external, recaived through an aperture as with a convex lens are exhibited in their natural colors on a surface arranged to receive them:used for sketching, exhibition purposes,ect.
Electromagnetic spectrum-the entire spectrum, consisdered as a continuun, of all kids of electric,magnetic,and visible,radiation,from gamma rays, having a wavelength of 0.001 angstorm to waves havong a wavelength of more than 1 million km.
WORD NEEDED TO DEFINE:
Aperture-also called aperture stop.optics.an opening,usually circular,that limits the quantity of light that can enter an optical instrument
Shutter-a mechanical device for opening and closing the aperture of a camera lens to expose film or the like.
Exposure-the total amount of light received by a photosensitive surface or an area of such a surface,expressed as the product of the degree of illumination.
Depth of field-the range if distances along the axis of an optical instrument,usually a camera lens, thriugh which an object will produce a relatively distinct image.
F-stop-the setting of an ajustable lens aperture, as indicated by an f number
Focal length- the distance from a focal point of a lens or mirror to the corresponding principal plane.
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