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प्रश्न
Draw a neat and labelled diagram of the structure of the human eye.
उत्तर
संबंधित प्रश्न
List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function.
How does the eye regulate the amount of light that falls on the retina?
How does the eye regulate the amount of light that falls on the retina?
Explain the following:
Mechanism of generation of light-induced impulse in the retina.
The size of the pupil becomes ______ when you see in dim light.
Explain the mechanism of vision.
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 |
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Which lens has a greater focal length?
What is the function of the lens in the human eye?
Name the part of our eyes which helps us to focus near and distant objects in quick succession.
Fill in the following blank with suitable word:
To bring light from a near object to a focus on the retina of the eye, the convex eye-lens need to be made....................
What change is made in the eye to enable it to focus on objects situated at different distances? Illustrate your answer with the help of diagrams.
How is the amount of light entering the eye controlled?
Describe the working of the human eye with the help of the above diagram.
Why does the eye-lens not have to do all the work of converging incoming light rays?
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.
Name two animals having eyes:
one the sides of the head.
Name the following:
The photoreceptors found in the retina of the eye.
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
Mention if the following statement is true (T) or false (F) Give reason.
yellow spot of the retina is the region of colour vision
What is a lacrimal gland?
Define the following:
Yellow spot
Choose the correct answer :
The rods and cones of a vertebrate retina function is to _________
Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.
Give Technical Term:
Name the part of the retina on which an object is focused for the clearest vision.
Give Technical Term:
The fluid which conveys the vibrations of sound in the cochlea and semicircular canals.
Mention, if the following statement is True or False
Rods are responsible for vision in the dark
Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:
- Name the type of lens in the human eye.
- Name the screen at which the maximum amount of incident light is refracted?
- State the nature of the image formed of the object on the screen inside the eye.
The muscular diaphragm that controls the size of the pupil is ____________.
Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?
The coloured portion of the eye is the ______.
What is ‘white of the eye’?
Match the following:
| Column - I | Column - II |
| 1. Retina | a) Path way of light |
| 2. Pupil | b) Far point comes closer |
| 3. Ciliary muscles | c) near point moves away |
| 4. Myopia | d) Screen of the eye |
| 5. Hypermetropia | e) Power of accommodation |
With reference to human eye, answer the following question.
What is aqueous humor?
Match the following:
| Column - I | Column - II | ||
| 1 | Retina | a | Path way of light |
| 2 | Pupil | b | Far point comes closer |
| 3 | Ciliary muscles | c | near point moves away |
| 4 | Myopia | d | Screen of the eye |
| 5 | Hypermetropoia | e | Power of accomodation |
Which of the following is responsible for the adjustment of the size of pupil?
Write the main functional activity of the following structure.
Choroid
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.
