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
With accommodation at rest, total refractory power of crystalline lens is - 
Select and explain. 
A. 14D, B. 16D, C. 18D, D. 20D
B: 16D
Answer: B: 16D 
Explanation: The diopteric power of reduced eye is +60D, of which +44D is contributed by cornea and +16D by the crystalline lens. Reference: Optics and refraction AK Khurana 7th edition page 31