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प्रश्न
In what two whys is a yellow spot different from the blind spot?
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उत्तर
The yellow spot has more cones and less rod cells. The blind spot has no photosensitive cells.
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संबंधित प्रश्न
Name the defect of vision which makes the eye-lens cloudy resulting in blurred vision.
Where is the near point of a person suffering from hypermetropia (or long-sightedness)?
The defect of vision which cannot be corrected by using spectacles is:
(a) myopia
(b) presbyopia
(c) cataract
(d) hypermetropia
To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses?
State one role of ciliary muscles in the human eye.
An old man cannot see objects closer than 1 m from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagram for the (i) defect of vision and also (ii) for its correction.
State the main functions of the following:
Tears
Differentiate between:
Myopia and Hypermetropia.
Due to elongation of _______ and increase in curvature of the eye lens, a person cannot see distant objects clearly.
Myopia and hypermetropia can be corrected by:
