Final answer:
The interference of 0.59 refers to the distance between adjacent bright fringes in an interference pattern produced by a He-Ne laser light passing through two slits.
Step-by-step explanation:
The interference of 0.59 refers to the distance between adjacent bright fringes in an interference pattern. In this case, the interference pattern is produced by a He-Ne laser light passing through two slits. The given number, 0.59, represents the distance between adjacent bright fringes.