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प्रश्न
What shape are your eye-lenses:
when you look at a distant tree?
उत्तर
When we look at a distant tree, the eye lens is thin. When we look at a far-off object, the eye is in a relaxed state. The eye lens becomes thin or less convex because a small converging power of the eye lens is sufficient to focus the parallel light rays from the distant object (the tree) to form an image on the retina.
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संबंधित प्रश्न
Write the function of the following part of the human eye: ciliary muscles
With the help of ciliary muscles the human eye can change its curvature and thus alter the focal length of its lens. State the changes that occur in the curvature and focal length of the eye lens while viewing (a) a distance object, (b) nearby objects.
Where does the greatest degree of refraction of light occur in the eye?
Give the scientific names of the following parts of the eye:
carries signals from an eye to the brain.
What changes take place in the shape of eye-lens:
when the eye is focused on a near object?
Describe and explain, how a normal eye can see objects lying at various distances clearly.
Which parts of the eye cause rays of light to converge on the retina?
A person got his eyes tested. The optician's prescription for the spectacles reads:
Left eye: − 3.00 D
Right eye: − 3.50 D
The person is having a defect of vision called:
(a) presbyopia
(b) myopia
(c) astigmatism
(d) hypermetropia
State the Location of:
Lacrimal gland
State the Location:
Iris
