हाल ही में समाचारों में आने वाले ‘LiFi’ के संदर्भ में निम्नलिखित कथनों में से कौन-सा/से सही है/हैं?
- 1.यह उच्च गति डेटा संचरण के लिए प्रकाश को माध्यम के रूप में प्रयुक्त करता है।
- 2.यह एक बेतार प्रौद्योगिकी है और ‘WiFi’ से कई गुना तीव्रतर है।
नीचे दिए गए कूट का प्रयोग कर सही उत्तर चुनिए।
Read this question in English
With reference to 'LiFi', 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 'WiFi'.
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
उत्तर और व्याख्या · explanation in English
Answer: (c) 1 और 2 दोनों
Li-Fi (Light Fidelity) is a form of visible light communication: an LED is switched on and off far faster than the eye can notice, and those flickers carry data through the air to a photodetector. It is wireless like Wi-Fi, but uses the visible-light band instead of radio waves and has reached speeds several times higher.
- ✓ 1. Li-Fi sends data by modulating visible light from LEDs rather than by radio waves; the Telecommunication Engineering Centre describes it as data transfer through LED light.
- ✓ 2. No cable is involved, so it is wireless. TEC's comparison puts Li-Fi at about 1 Gbps against about 150 Mbps for Wi-Fi (IEEE 802.11n), several times faster, though over a short range of under 10 metres.
Remember · Li-Fi = wireless data over visible light from LEDs (IEEE 802.15.7); faster and more secure than Wi-Fi, but short-range and blocked by walls.
Sources
- Telecommunication Engineering Centre (DoT): Study Paper on LiFi (Light Fidelity) & its Applications ↗ “Li-Fi provides better bandwidth, efficiency, connectivity and security than Wi-Fi and has already achieved high speeds larger than 1 Gbps under the laboratory conditions.”
- PIB, Ministry of Electronics and IT: C-DAC Chennai transfers Li-Fi technologies (28 November 2024) ↗ “Visible Light Communication (VLC)/Light Fidelity (Li-Fi) uses light waves instead of traditional radio waves to transmit data, offering unprecedented advantages such as faster speeds, enhanced security, and greater energy efficiency.”
Question and answer: UPSC's official GS Paper I (2016, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·