Human Eye and C...

Which of the following statements is correct?

What is the least distance of distinct vision of a normal human eye?

If there had been one eye of the man, then 

If the distance of the far point for a myopia patient is doubled, the focal length of the lens required to cure it will become 

The sensation of vision in the retina is carries to the brain by 

The far point of the myopic eye is $$250\ cm$$, then the focal length of the lens to be used will be 

When the power of eye lens increases, the defect of vision is produced. This  defect of vision is known as 

A student can distinctly see the object upto a distance $$15\ cm$$. He wants to see the black board at a distance of $$3\ m$$. Focal length and power of lens used respectively will be 

The power of a lens used to remove the myopic defect of an eye is 0.66 D. The far point for this eye is (nearly) :

A person can see clearly objects between 15 and 100 cm from his eye. The range of his vision if he wears close fitting spectacles having a power of 0.8 diopter is :