Complete the following sentences:
(a) A short-sighted person cannot see _______ objects clearly. Short-sightedness can be corrected by using
_______ lenses.
(b) A long-sighted person cannot see _______ objects clearly. Long-sightedness can be corrected by using
_______ lenses.
(a) A short-sighted person cannot see distant objects clearly. Short-sightedness can be corrected by using
Concave lenses.
(b) A long-sighted person cannot see nearby objects clearly. Long-sightedness can be corrected by using
convex lenses.