You need to be able to describe (in a 3 or 4 mark way) the method by which a digital camera captures an image. Generally this should involve the use of the the terms CCD and A/D converter. I find it easiest to break down the process into steps:
1. Light enters the lens of the camera
2. CCD converts the light into voltage
3. The voltage (an analogue signal) is digitised by the Analogue to Digital converter
4. The picture can now be stored on a digital medium (e.g. solid state memory)
