Computer Science for IGCSE & O level - Hardware (Section 3 - No. 8)
How does the wavelength of the laser beam used in Blu-ray discs compare to that used in DVDs?
Blu-ray uses a longer wavelength laser.
Blu-ray uses a shorter wavelength laser.
They both use the same wavelength laser.
The laser wavelength doesn't affect capacity.
Explication
Blu-ray uses a shorter wavelength laser than DVDs.