25 m
2.5 cm
25 cm
2.5 m
The minimum distance at which an object can be seen clearly and distinctly is termed the least distance of distinct vision. For a young adult with normal vision, this distance is 25 cm.
Therefore, option (C), 25 cm, is the correct answer.
Tara's grandmother is 70 years old and has a passion for embroidery. She faces difficulty in threading the needle as the eye of the needle appears blurred. The ophthalmologist diagnosed it as an age-related disorder. 
(a) Name the eye disorder she is suffering from.
(b) How can the above defect be corrected?
(c) Where is the image formed in the above disorder?