Lenses to be used by a person who cannot see distant objects are:
A.Concave
B.Convex
C.Plane
D.Bifocal
A.Concave
B.Convex
C.Plane
D.Bifocal
A.Red, green and blue
B.White, orange and yellow
C.Red, orange and violet
D.None of these
A.Cones
B.Rods
C.Both (a) & (b)
D.Crystalline lens
A.Sycon
B.Cockroach
C.House-fly
D.Star-fish
A.Different in different eyes
B.Similar in all eyes
C.Similar in all vertebrate eyes
D.Red in all eyes
A.Pupil
B.Vitreous humour
C.Ciliary muscles
D.Cornea
A.Glaucoma
B.Presbyopia
C.Myopia
D.Astgmatism
A.Cataract
B.Glaucoma
C.Astigmatism
D.None of these
A.Digestive system
B.Ambulacral system
C.Both (a) & (b)
D.None of these
A.Star-fish
B.Mosquito
C.Earthworm
D.None of these