With reference to Visible Light Communication (VLC) technology, which of the following statements are…

With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? 1. VLC uses electromagnetic spectrum wavelengths 375 to 780 nm. 2. VLC is known as long-range optical wireless communication. 3. VLC can transmit large amounts of data faster than Bluetooth. 4. VLC has no electromagnetic interference. Select the correct answer using the code given below:
  1. 1, 2 and 3 only
  2. 1, 2 and 4 only
  3. 1, 3 and 4 only
  4. 2, 3 and 4 only

Solution

VLC uses visible light (about 380-750 nm) — statement 1 correct. It is a short-range, not long-range, technology — statement 2 wrong. Data rate is much higher than Bluetooth — statement 3 correct. It does not suffer from EM interference (uses light) — statement 4 correct. Answer: (c) 1, 3 and 4 only.

Asked in: UPSC Prelims 2020

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