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प्रश्न
State the Location:
Iris
उत्तर
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संबंधित प्रश्न
What kind of lens is present in the human eye?
Give the scientific names of the following parts of the eye:
muscles which change the shape of the eye-lens.
Which of the following changes occur when you walk out of bright sunshine into a poorly lit room?
(a) the pupil becomes larger
(b) the lens becomes thicker
(c) the ciliary muscle relaxes
(d) the pupil becomes smaller
The size of the pupil of the eye is adjusted by:
(a) cornea
(b) ciliary muscles
(c) optic nerve
(d) iris
Mention if the following statement is true (T) or false (F) Give reason.
Sometimes medicines dropped into the eyes come into the nose and even throat
The figure below compares a part of our eye with a part of a photographic camera.
Name the corresponding parts of the eye the camera shown here that are comparable in function.
Give scientific reason:
One can sense colours only in bright light.
Name the following:
White part of the eye.
Give the main function of the following:
Fovea centralis
Differentiate between:
Vitreous humour and Aqueous humour.
Choose the Odd One Out:
A small hole of changing diameter at the centre of Iris is called _______.
The following figure show the change in the shape of the lens while seeing distant and nearby objects. Complete the figures by correctly labelling the diagram.
In a myopic eye, the image of the object is formed
A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in Figure . In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?
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| (i) | (ii) | (iii) | (iv) |
A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible?
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| (A) | (B) | (C) | (D) |
Given below is a cross section of the human eye. Match the structures marked (a) to (e) with their correct functions:
Example: (f) - 6. Holds the lens in position
| Cross section of Human Eye | Functions | |
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1. | Protects retina |
| 2. | Regulates the size of the pupil | |
| 3. | Alters the shape of the lens | |
| 4. | Keeps the lens moist | |
| 5. | Transmits nerve impulses to brain | |
| 6. | Holds the lens in position |
Chris was watching the display of fireworks in the sky.
- Trace the path of the light rays using the following terms:
Fovea, Lens, Conjunctiva, Pupil, Cornea. - Name the nerve that carries the impulse for vision to the brain.
Name the following:
The fibres which collectively hold the lens in position.
