This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and refraction, Subject name: Ophthalmology
Which component of the eye has 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 eys. The refractive indices of the successive layers of lens increase from the periphery towards the nucleus. Therefore:- Anterior lens coex- refractive index is 1.386. Posterior lens coex -refractive index is 1.386. Centre of lens(nucleus)- Refreactive index is 1.46. Reference: AK khurana 7th edition