Explain the physical and optical process by which an optical drive (such as a Blu-ray or DVD player) reads stored binary data from a spinning disc. Your explanation should detail the physical features of the disc and how variations in light reflection are converted into digital signals.
Practise AQA GCSE Computer Science Hardware and software with exam-style questions for GCSE Computer Science. 51 questions, matched to the AQA GCSE Computer Science (8525) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.