Detailed Explanation:

Answer: Option 3 — 1, 3 and 4 only

Visible Light Communication (VLC) is an optical wireless communication technology that uses visible light spectrum for data transmission. Statements 1, 3, and 4 correctly describe VLC's characteristics, while statement 2 incorrectly classifies it as long-range communication.

✅ Statement 1 – Correct: VLC operates in the visible light spectrum range of 375 nm (violet) to 780 nm (red), which falls within the electromagnetic spectrum.

❌ Statement 2 – Incorrect: VLC is a short-range optical wireless communication technology, typically limited to distances within a room or line-of-sight areas, not long-range communication.

✅ Statement 3 – Correct: VLC can achieve data transmission speeds significantly faster than Bluetooth, with potential speeds reaching several Gbps compared to Bluetooth's maximum of around 50 Mbps.

✅ Statement 4 – Correct: Since VLC uses light waves instead of radio frequencies, it does not cause or suffer from electromagnetic interference (EMI), making it suitable for sensitive environments like hospitals and aircraft.

📝 Short Notes: Visible Light Communication (VLC)

• Technology Basis: Uses LED bulbs to transmit data through rapid light intensity modulation imperceptible to the human eye
• Spectrum Range: Operates in 375-780 nm wavelength (visible light spectrum)
• Speed: Can achieve data rates from 100 Mbps to several Gbps, much faster than WiFi and Bluetooth
• Range: Short-range technology, typically effective within 10 meters in line-of-sight conditions
• Advantages: No electromagnetic interference, high security (light cannot penetrate walls), energy efficient, uses existing LED infrastructure
• Limitations: Requires line-of-sight, affected by ambient light, cannot work through opaque objects
• Applications: Indoor navigation, underwater communication, secure data transfer in sensitive areas, vehicle-to-vehicle communication
• Li-Fi: A related technology that uses VLC for high-speed wireless internet connectivity