Advertisements
Advertisements
प्रश्न
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?
उत्तर
(i) Hypermetropia.
(ii) There are two main conditions in the eye which is responsible for this defect :
1. Shortening of the eyeball from front to back.
2. The lens is less concave.
(iii) Correction of Hypermetropia:
(iv) Both the eyes facing forward helps in judging the depth or relative distance. This is due to overlapping images formed in brain from both eyes which focus on an object together at one time.
APPEARS IN
संबंधित प्रश्न
Write the function of the following part of the human eye: crystalline lens
Myopia is an example of ______.
What kind of lens is present in the human eye?
Give the scientific names of the following parts of the eye:
a hole in the middle of the iris.
Fill in the following blank with suitable word:
The iris controls the amount of................entering the eye.
What happens to the size of pupil of our eye (i) in dim light (ii) in bright light?
Describe the working of the human eye with the help of the above diagram.
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.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Cones : Iodopsim :: Rods : ______.
Differentiate between members of the following pair with reference to what is asked in bracket.
Rod and cone cells (pigment contained)
We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.
State the Function:
Iris
State the Function:
Choroid coat in the eye
Complete the following sentence with appropriate Word
The aperture in the eye through which light enters is the:
Which cells of the retina enable us to see coloured objects around us?
The change in the focal length of an eye lens in human beings is caused by the action of ______.
Write in proper sequence the names of all the parts of the human eye through which the light rays coming from an object pass before they form an image on the retina.
An aperture that controls the passage of light into the eye is ______.
Differentiate between members of the following pair with reference to what is asked in the bracket.
Aqueous humour and vitreous humour (location).
With reference to human eye answer the question that follow:
Name the part of the eye associated with the layer providing nourishment to the eye.
