Optical fibre: light guided by total internal reflectionप्रकाशिक तंतु: पूर्ण आंतरिक परावर्तन से प्रकाश का संचरणOptical fibre: light guided by total internal reflection

NCERT Fig 9.14 · Class 12 Physics · Chapter 9 · interactive diagram

Parts and what they mean

• Core (क्रोड) — High-quality glass/quartz with the HIGHER refractive index; the light travels in it.
• Cladding (आवरण (क्लैडिंग)) — Surrounding layer with a LOWER refractive index, so core→cladding is denser→rarer and TIR can happen.
• Light signal (प्रकाश संकेत) — Enters one end at a suitable angle and strikes the core wall at more than the critical angle each time, so it is totally reflected again and again — even round bends — with very little loss.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 9.14. Report a mistake