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प्रश्न
We cannot distinguish colours in dim light. Explain giving suitable reasons.
उत्तर
Rods are abundantly found in the retina and are sensitive to dim light. Rods also detect changes in the intensity of light across the field of vision and thus aid in the perception of movement. Rods do not play a role in distinguishing colour, and cones are insensitive to dim light. That is why colours can't be seen in dim light.
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संबंधित प्रश्न
The region of the vertebrate eye, where the optic nerve passes out of the retina, is called the
(a) fovea
(b) iris
(c) blind spot
(d) optic chaisma
What is the name of:
the light-sensitive layer in the eye?
What is the function of the lens in the human eye?
Name the part of our eyes which helps us to focus near and distant objects in quick succession.
Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
Which of the following have a wider field of view?
(a) Animals having two eyes on the opposite sides of their head.
(b) Animals having two eyes at the front of their head.
Out of animals of prey and predators, which have their eyes:
on the opposite sides of their head?
Name two animals having eyes:
at the front of the head.
Mention, where in living organism is the following located and state their main function:
Fovea centralis
Name the following:
Short sightedness.
Give Technical Term:
The adjustment of the eye in order to obtain a clear vision of objects at different distances
State the Function:
Choroid coat in the eye
The muscular diaphragm that controls the size of the pupil is ____________.
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
From where the following nerves arise.
Optic nerve
Which part of the eye gets affected if someone is suffering from cataract? How is it treated?
The innermost layer of human eye is ______.
Vitreous humour is present between ______.
Match the following:
| Column - I | Column - II |
| 1. Retina | a. Path way of light |
| 2. Pupil | b. Far point comes closer |
| 3. Ciliary muscles | c. near point moves away |
| 4. Myopia | d. Screen of the eye |
| 5. Hypermetropia | e. Power of accommodation |
Match the following:
| Column - I | Column - II |
| 1. Retina | a. Path way of light |
| 2. Pupil | b. Far point comes closer |
| 3. Ciliary muscles | c. near point moves away |
| 4. Myopia | d. Screen of the eye |
| 5. Hypermetropia | e. Power of accommodation |
