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17 May, 2020
2 Min Read
Light-fidelity (LiFi) is a technology used for free-space communication using visible and near-visible light. It is similar to Wireless Fidelity (WiFi), a technology for wireless local area network communication using microwaves. Microwaves can pass through walls while transmitting signals whereas visible and near-visible light cannot pass through walls. Thus it makes LiFi signal network more secure.
Scientists have recently added a new layer of security to LiFi. Light bounces off from walls and falls on the receiver. So wall boundaries can be used effectively for reflecting signals so that communication is maintained even without line-of-sight communication between the signal source and receiver. Receiving detectors can receive both direct and reflected signals.
Walls painted with fluorescent and phosphorescent paints absorb and then emit light with marginal loss. The paints continue to emit light even several hours after the original source of light has been switched off. This makes the communication signal more effective and secure.
Source: TH
05 Apr, 26
A year after tensions arising from Operation Sindoor, India and Azerbaijan have taken steps to restore and normalise bilateral relations. The 6th round of Foreign Office Consultations, held in Baku, marked the first such engagement since 2022, signaling renewed diplomatic momentum. Recent Diplomatic Engagement During the consultations, bo
04 Apr, 26
The India–Australia Economic Cooperation and Trade Agreement has completed four years since its signing. Both countries now aim to build on this progress through strengthened collaboration and ambitious targets, including reaching AUD 100 billion in bilateral trade by 2030. What is the India–Australia Economic Cooperation and Tra
03 Apr, 26
A recent report by the Association for Democratic Reforms (ADR) analyses donations of ?20,000 or more declared to the Election Commission of India (ECI) by national political parties for FY 2024–25, highlighting transparency and accountability in political financing. Key Findings Massive Funding Surge Total donations to nationa
03 Apr, 26
Maritime chokepoints are narrow channels along global shipping routes where maritime traffic is concentrated. These points are geopolitically and economically critical, as they handle a large proportion of global trade, especially energy shipments. Current Relevance Over two-thirds of seaborne energy trade passes through a handful o
01 Apr, 26
Following the launch of Operation Epic Fury (U.S.) and Operation Roaring Lion (Israel), the geopolitical landscape has shifted fundamentally with the confirmed death of Iran’s Supreme Leader, Ayatollah Ali Khamenei.Iran retaliated through Operation True Promise 4, launching missile attacks against Israel and nearby Gulf states. The escala
05 Apr,2026
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