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 :
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Answer: C. Statement 1 is correct: VLC uses visible light of about 375 to 780 nm. Statement 2 is wrong: VLC is a short-range technology because light does not pass through walls. Statement 3 is correct: it can carry data faster than Bluetooth. Statement 4 is correct: it does not cause radio-frequency electromagnetic interference. So 1, 3 and 4.
Watch for: 'Optical wireless' sounds like it can go far, but visible light is blocked by walls.
Why the other options are wrong
- A. Wrong because VLC is short-range, not long-range.
- B. Wrong because VLC is short-range.
- D. Wrong because VLC is short-range.
Source to check: IEEE 802.15.7 Visible Light Communication standard; Department of Science and Technology / PIB releases on Li-Fi
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.