This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
Most impoant factor in convergence of light rays on retina is 
Select and explain. 
A. Length of eye ball, B. Dioptre power of lens, C. Centre of lens, D. Cornea
D: Cornea
Answer: D: Cornea 
Explanation: Convergence of light rays on retina is due to cornea Ref khurana 6/e