"Lens"- Used to make images of objects appear on photographic paper.
"Light"- A visible strand of electromagnetic radiation.
"Shutter Button"- a button that a typical camera has and it takes a photo each time it is pressed down.
aperture-an small opening that limits the amount of light that enters 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 act of presenting a photosensitive surface to rays of light.
depth of field- the range of distances along the axis of an optical instrument, usually a camera lens, through which an object will produce a relatively distinct image.
f-stop- the setting of an adjustable lens aperture, as indicated by an f number.
focal length- the distance between an object lens and its corresponding focal plane in a telescope.
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