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प्रश्न
For a normal human eye the near point is at _______.
विकल्प
2.1 cm
2.5 cm
25 cm
5 cm
उत्तर
For a normal human eye the near point is at 25 cm.
APPEARS IN
संबंधित प्रश्न
Write the function of the following part of the human eye: crystalline lens
Answer briefly:
How do you perceive the colour of an object?
Draw a labelled sketch of the human eye.
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
State whether these lenses are thicker in the middle or at the edges.
Name the part of the eye:
which controls the amount of light entering the eye.
State whether the following statement is true or false:
The image formed on our retina is upside-down
What is the least distance of distinct vision for a normal human eye?
Give the scientific names of the following parts of the eye:
carries signals from an eye to the brain.
Give the scientific names of the following parts of the eye:
changes shape to focus a picture on the retina.
Fill in the following blank with suitable word:
Most of the refraction of light rays entering the eye occurs at the outer surface of the.............
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 converging power of eye-lens will be the maximum?
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
Which of the following controls the amount of light entering the eye?
(a) ciliary muscles
(b) lens
(c) iris
(d) cornea
Which parts of the eye cause rays of light to converge on the retina?
Which part brings the image into sharp focus on the retina? How does it do this?
Explain why, when it is getting dark at night, it is impossible to make out the colour of cars on the road.
A person got his eyes tested. The optician's prescription for the spectacles reads:
Left eye: − 3.00 D
Right eye: − 3.50 D
The person is having a defect of vision called:
(a) presbyopia
(b) myopia
(c) astigmatism
(d) hypermetropia
Having two eyes gives a person:
(a) deeper field of view
(b) coloured field of view
(c) rear field of view
(d) wider field of view
What is a lacrimal gland?
Give scientific reason:
We cannot clearly see an object kept at a distance less than 25 cm from the eye.
Name the following:
The opening through which light enters the eyes.
Name the following:
The area where the image is formed but not seen by our eye is termed as.
Give Technical Term:
Name the part of the retina on which an object is focused for the clearest vision.
State the Function:
Iris
State the Function:
Cornea
Choose the Odd One Out:
Complete the following sentence with appropriate Word
The part of the human eye where rod cells and cone cells are located is the:
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.
Write the name.
The screen with light sensitive cells in human eye.
The image of the object in the human eye is formed on the cross screen.
For a healthy human eye, the distant point is infinite distance.
Write an Explanation.
Power of accommodation
______ is the structural and functional unit of living organisms.
______ of the eye is comparable to the film of a camera.
What is ‘white of the eye’?
| 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 accomodation |
The layer in the eye where sensory cells (rods and cones) are located ______.
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.
