UPSC Previous Year Question | Prelims GS | 2020

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.

  1. 1, 2 and 3 only
  2. 1, 2 and 4 only
  3. 1, 3 and 4 only
  4. 2, 3 and 4 only

Answer

Correct Answer

1, 3 and 4 only

Explanation

VLC uses the visible spectrum (about 375-780 nm), offers much higher data rates than Bluetooth and causes no electromagnetic (RF) interference. It is a short-range, not long-range, optical wireless technology, so statement 2 is wrong.

Topics: communication technologies, information technology & computing, science & technology, visible light communication (li-fi)