A person suffering from ‘presbyopia’ (myopia and hyper metropia both defects) should use |
|
a) |
A concave lens |
b) |
A convex lens |
c) |
A bifocal lens whose lower portion is convex |
d) |
A bifocal lens whose upper portion is convex |
A person suffering from ‘presbyopia’ (myopia and hyper metropia both defects) should use |
|
a) |
A concave lens |
b) |
A convex lens |
c) |
A bifocal lens whose lower portion is convex |
d) |
A bifocal lens whose upper portion is convex |
(c) A bifocal lens consist of both convex and concave lenses with lower part is convex |