What is the medium used in optical storage systems for reading and recording data ?
[amp_mcq option1=”High-energy visible light” option2=”Laser light” option3=”Ultraviolet light” option4=”Black light” correct=”option2″]
This question was previously asked in
UPSC CISF-AC-EXE – 2021
Optical storage systems, such as CDs, DVDs, and Blu-ray discs, use a focused beam of light to read and write data on the surface of the disc. This light is typically produced by a laser diode. The laser beam interacts with the data layer on the disc, and changes in the reflected light are detected and interpreted as data (pits and lands representing binary 0s and 1s). For writing, a higher power laser is used to physically alter the data layer.
– Optical storage relies on light to interact with the storage medium.
– Lasers provide the focused, coherent light required for the high data densities and precision needed in optical storage.