Near and far points of a young person normal eye respectively are……….
a) 0 and infinity
b) 0 and 25 cm
c) 25 cm and infinity
d) 25 cm and 150 cm
Myopia and hypermetropia can be corrected by………………
a) concave and plano- convex lens
b) concave and convex lens
c) convex and concave lens
d) plano- concave lens for both defects
myopia is corrected by using of suitable power of concave lens while hypermetropia is corrected by convex lens
Bi-focal lens are required to correct………..
a) astigmatism
b) coma
c) myopia
d) presbyopia
bifocal lens are required to correct the presbyopia. Upper point of bifocal lens consists of concave lens used for distant vision while lower point consists of convex lens facilitate near vision
The image formed on the retina of the human eye is………..
a) virtual and inverted
b) real and inverted
c) real and erect
d) virtual and erect
Muslim Scientists in ophthalmology
The father of “modern optics” known as……..
a) Ibnsina
b) Ali bin Isa
c) Ibn Al Hatham
d) none of these
