UPSC Prelims 2016 – Question 5

Q5. With reference to ‘Li-Fi’, recently in the news, which of the following statements is/are correct?

1. It uses light as the medium for high-speed data transmission.
2. It is a wireless technology and is several times faster than ‘Wi-Fi’.

Select the correct answer using the code given below.
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

The correct answer is Both 1 and 2. 

• LiFi  

• It is a wireless technology that transmits high-speed data using visible light communication (VLC) as a medium of transmission. Hence statement 1 is correct. 
• ​It is loosely expanded to Light-Fidelity. 
• By using precisely controlled light modulation, data can be transmitted using regular, visible light. 
• It will also allow connectivity in environments that do not currently readily support Wi-Fi, such as aircraft cabins, hospitals and hazardous environments.  

• This technology is 100 times faster than the average wifi speeds. Hence statement 2 is correct.  
• It can transmit up to 100 Gbps. 

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