Science
The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to
- presbyopia
- accommodation
- near-sightedness
- far-sightedness
Related Questions
The change in focal length of an eye lens is caused by the action of the
- pupil
- retina
- ciliary muscles
- iris
A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?
The least distance of distinct vision for a young adult with normal vision is about
- 25 m
- 2.5 cm
- 25 cm
- 2.5 m
The human eye forms the image of an object at its
- cornea
- iris
- pupil
- retina