Computer Science for IGCSE & O level - Hardware (Section 13 - No. 34)
What is a key feature that distinguishes Blu-ray discs from DVDs?
Blu-ray uses a red laser.
Blu-ray has a higher storage capacity.
Blu-ray uses a shorter wavelength laser.
Blu-ray is cheaper to manufacture.
Forklaring
Blu-ray has more storage capacity due to the shorter wavelength laser.