Some of the uses of visible light communication are to display information on sign boards, Li-Fi (to provide very high internet speeds), underwater communication, communication between vehicles, etc. You can read about UPSC Mains General Studies Paper-III Strategy, Syllabus & Structure in the given link.

Further readings:

  1. Topic-Wise GS 3 Questions for UPSC Mains
  2. Science & Technology Notes For UPSC – General Science Notes 

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