The power of a lens used by short sighted person, is -2D. Find the maximum distance of an object which he can see without spectacles.

A short-sighted man, the accommodation of whose eye is between 12 cm and 60 cm wears spectacles through which he can see remote objects distinctly. Determine the minimum distance at which the man can read a book through his spectacles.

A short-sighted person cannot see the ….. Object distinctly.

A short - sighted person may read a book without spectacles. Comment.

A far sighted person has his near point 50 cm. Find the power of lens he should use to see at 25 cm clearly.