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प्रश्न
Mention, where in living organism is the following located and state their main function:
Fovea centralis
उत्तर
Fovea centralis is located at the back of the eye almost at the centre of the eyeball. It is the region of the brightest vision and also of the colour vision.
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संबंधित प्रश्न
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to ______.
Myopia is an example of ______.
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Which is the weaker eye?
Name the part of the eye:
which controls the amount of light entering the eye.
Give the scientific names of the following parts of the eye:
carries signals from an eye to the brain.
Give the scientific names of the following parts of the eye:
changes shape to focus a picture on the retina.
Fill in the following blank with suitable words:
When light is dim, the pupil becomes................
The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case:
the focal length of eye-lens will be the maximum?
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot.
To focus the image of a nearby object on the retina of an eye:
(a) the distance between eye-lens and retina is increased
(b) the distance between eye-lens and retina is decreased
(c) the thickness of eye-lens is decreased
(d) the thickness of eye-lens is increased
State whether the following statement is true or false:
Rabbit has eyes which look sideways.
Give scientific reason:
One can sense colours only in bright light.
Select the odd one in the following series:
Retina, Sclera, Ciliary body, Nephron.
What is the nature of the image that forms on the retina?
State the Function:
Visual purple
In a myopic eye, the image of the object is formed
The black opening between the aqueous humour and the lens is called ____________.
We cannot distinguish colours in dim light. Explain giving suitable reasons.
Name the following:
Three layers of the eye ball.
