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 Form 4 Physics online lessons on thin lenses

Lesson on the Camera

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Answer Text:
The camera
– consists of a converging lens system, clicking button, shutter, diaphragm and a mounting base for the film all enclosed in a light proof box.
The distance is adjusted to obtain a clear focus. The diaphragm has a hole called the aperture with an adjusting control knob to control the amount of light entering the camera. The shutter opens to allow light and close at a given time interval.