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प्रश्न
Which of the following is responsible for the adjustment of the size of pupil?
विकल्प
Iris
Sclera
Lens
Choroid
उत्तर
Iris
Explanation:
The iris is also an extension of the choroid, partially covering the lens and leaving a circular opening in the centre, the pupil.
संबंधित प्रश्न
Match the following:
| Column I | Column II |
| (i) Myopia | (a) Converging power of eye lens becomes low |
| (ii) Hypermetropia | (b) Converging power of eye lens remains the same |
| (c) Converging power of eye lens becomes high |
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
Which lens bends the light rays more strongly?
Name the part of the eye:
which controls the amount of light entering the eye.
Name the part of the eye:
which changes the focal length of eye-lens.
Name that part of the eye which is equivalent to the photographic film in a camera.
The descriptions of five kinds of images are given below:
(a) diminished and virtual
(b) enlarged and real
(c) enlarged and erect
(d) real and inverted
(e) virtual and the same size
Which one of these describes the image formed:
(i) on the retina of the eye?
(ii) by a magnifying glass?
(iii) by a convex driving mirror on a car?
(iv) by a plane mirror?
(v) on the screen of a slide projector?
A student sitting on the last bench in the class cannot read the writing on the blackboard clearly but he can read the book lying on his desk clearly. Which of the following statement is correct about the student?
(a) The near point of his eyes has receded away.
(b) The near point of his eyes has come close to him.
(c) The far point of his eyes has receded away.
(d) The far point of his eyes has come closer to him.
Among animals, the predators (like lions) have their eyes facing forward at the front of their heads, whereas the animals of prey (like rabbit) usually have eyes at the sides of their head. Why is this so?
The animals of prey have:
(a) two eyes at the front
(b) two eyes at the back
(c) two eyes on the sides
(d) one eye at the front and one on the side
With reference to the functioning of the eye, answer the question that follow:
Name the cells of the retina and its respective pigments which get activated in the dark.
What is the function of iris and the muscles connected to the lens in human eye?
Give Technical Term:
The adjustment of the eye in order to obtain a clear vision of objects at different distances
State the Location of:
Lacrimal gland
Choose the Odd One Out:
Vision defect that increases distance between the lens of the eye and retina of the eye is termed as myopia.
Write an Explanation.
Power of accommodation
In a myopic eye, the image of the object is formed
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
Describe the parts in the external structure of the eye.
With neat, labeled diagram describe the structure of retina of eye.
