NEET2005PhysicsRay OpticsActual
What should be the maximum acceptance angle at the air-core interface of an optical fibre if n₁ and n₂ are the refractive indices of the core and the cladding, respectively?
Options
- A⁻¹ (n₂ / n₁ )
- B⁻¹ n₁^2-n₂^2
- C[ ⁻¹ n₂ n₁ ]
- D[ ⁻¹ n₁ n₂ ]
Correct answer
B. ⁻¹ n₁^2-n₂^2
Step-by-step solution
Core of acceptance angle = ⁻¹ n₁ ^2-n₂^2 .