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प्रश्न
State the Function:
Vitreous humour
उत्तर
It binds the eye ball to the bony orbit of the skull and supplies nourishment.
Notes
It maintains the shape of eyeball.
APPEARS IN
संबंधित प्रश्न
Write the function of the following part of the human eye: Cornea
Compare the following: Choroid and retina
The size of the pupil becomes ______ when you see in dim light.
Name two parts of the eye which refract light rays (or bend light rays).
What is the function of the lens in the human eye?
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?
Refraction of light in the eye occurs at:
(a) the lens only
(b) the cornea only
(c) both the cornea and the lens
(d) the pupil
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
Explain why, when it is getting dark at night, it is impossible to make out the colour of cars on the road.
Mention the characteristics of the image that falls on the retina of the eye.
Write whether the following is true or false:
Rods are the receptor cells in the retina of the eye sensitive to dimlight.
The diagram alongside represents a certain defect of vision of the human eye.
(i) Name the defect.
(ii) Describe briefly the condition in the eye responsible for the defect.
(iii) Redraw the figure by adding a suitable lens correcting the defect. Label the parts through which light-rays pass.
(iv) What special advantage do human beings derive in having both eyes facing forward?
Name the following:
The area where the image is formed but not seen by our eye is termed as.
Shylesh is a school-going kid studying standard VIII. He is crazy about playing video games on mobile phones. After a couple of months, his eyes turned red and he felt severe pain in his eyes. His science teacher enquired about this and advised his parents to take him to an eye doctor.
- How does excessive usage of mobile phone affect our eyes?
- What are the values shown by the teacher?
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) |
What kind of lens is there in our eyes? Where does it form the image of an object?
In human eye the part which allows light to enter into the eye is ______.
Name the following:
The circular opening enclosed by iris.
An aperture that controls the passage of light into the eye is ______.
Give reason:
Blind spot is considered as 'area of no vision'.
