An optician while testing the eyes finds the vision of a patient to be 6/12. By this means that

• A

  The person can read the letters of 6 inches from a distance of 12 m

• B

  The person can read the letters of 12 inches from 6 cm

• C

  The person can read the letters from 6m which the normal eye can read from 12 m

• D

  The focal length of eye lens had become half that of the normal eye.