With reference to Visible Light Communication (VLC) technology, which

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, 2 and 3 only

1, 2 and 4 only

1, 3 and 4 only

2, 3 and 4 only

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC IAS – 2020

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Statement 1 is correct as Visible Light Communication (VLC) utilizes the visible light portion of the electromagnetic spectrum, which ranges from approximately 380 to 780 nanometers. The range 375 to 780 nm falls within or very close to this standard definition. Statement 2 is incorrect; VLC is generally considered a short-range communication technology because visible light is easily blocked by walls and opaque objects and does not penetrate them like radio waves. Statement 3 is correct; VLC, also known as Li-Fi, has the potential for significantly higher data transmission speeds compared to Bluetooth due to the vast available bandwidth in the visible light spectrum. Statement 4 is correct; VLC operates in a different part of the electromagnetic spectrum than radio-frequency communication (like Wi-Fi or Bluetooth), meaning it does not cause electromagnetic interference with radio-based systems.

VLC uses visible light for data transmission, offering high speed and immunity to radio interference, but is limited in range.

VLC utilizes LEDs which can be switched on and off very rapidly, faster than the human eye can perceive, to transmit data signals. Potential applications include indoor navigation, high-speed internet access in confined spaces, and communication in electromagnetically sensitive environments.

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