1.)Image sensor- were you store photographs on flash memory.
2.)Diaphragm- Controls the diameter of the aperture.
3.)Ground glass- A glass whose surface has been ground to produce a flat but rough finish.
4.)Visible Spectrum- The portion of the electromagnetic spectrum that is visible to the human eye.

1.)aperture-A hole or an opening through which light travels.
2.)shutter-A push-button found on many cameras, used to take a picture.
3.)exposure- The total density of light allowed to fall on the sensor during the taking of a photograph
4.)depth of field-The distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image.
5.)F-stop-a dimensionless number that is a quantitative measure of lens speed, an important concept in photography.
6.)focal length- A measure of how strongly the system converges or diverges light.