Why can a laser disc that is written with a blue laser store more information th

Question

Why can a laser disc that is written with a blue laser store more information than a laser disc that is written with a red laser ? Laser light with a circular cross-section passes through a slit in an opaque card. The slit is shaped as shown below. After passing through the slit and traveling a great distance the bearn no longer will have a circular cross-section. Which of the spot patterns shown is the most likely shape of the beam after passing through the slit and traveling a great distance? Briefly explain .

Explanation / Answer

a) Wavelength of blue light is shorter than of red light.Shorter wavelength means it takes less space for same number of waves.hence Disc written with blue laser has more information.

b) because of diffrection , beam will elongatedin y direction so option 2 is correct

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