UPSC CSE Prelims 2020 Q39 — Science & Technology PYQ with Answer

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: