This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Which component of the eye has a maximum refractive index – 
Select and explain. 
A. Anterior surface of the lens, B. Posterior surface of the lens, C. Centre of the lens, D. Cornea
C: Centre of the lens
Answer: C: Centre of the lens 
Explanation: Lens has maximum refractive index among the refractive structures of eye. The refractive indices of the successive layers of lens increase from the periphery towards the nucleus. Therefore :-


Anterior lens cortex →  Refractive index is 1.386.
Posterior lens cortex → Refractive index is 1.386.
Centre of lens (nucleus) →  Refractive index is 1.46.