For a light pipe as shown in the figure:
(A) Optical density of core should be greater than the optical density of cladding
(B) r and θ will always be equal
(C) Optical density of cladding is sinθ.sin i / sin r
(D) Optical density of cladding is sin r.sin i / sin θ
Choose the correct answer from the options given below:
1
(A), (B) and (D) only
2
(A), (B) and (C) only
3
(A), (C) only
4
(B), (C) and (D) only