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प्रश्न
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.
उत्तर
- The human eye's lens is a transparent, crystalline double convex lens.
- Maximum amount of incident light is refracted inside the eye at the outer surface of the cornea.
- The image of the object created on the inside screen of the eye is real and inverted.
APPEARS IN
संबंधित प्रश्न
Write the function of the following part of the human eye:- iris
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to ______.
Draw labelled diagrams of the following: Eye
Differentiate between: Rods and cones
The region of the vertebrate eye, where the optic nerve passes out of the retina, is called the
(a) fovea
(b) iris
(c) blind spot
(d) optic chaisma
What changes the shape of lens in the eye?
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.
What happens to the eye when you enter a darkened cinema hall from bright sunshine? Give reason for your answer.
A person walking in a dark corridor enters into a brightly lit room:
State the effect on the pupil of the eye.
Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot.
What is presbyopia? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
How much is our field of view:
with both eyes open?
Name two animals having eyes:
at the front of the head.
Differentiate between members of the following pair with reference to what is asked in bracket.
Rod and cone cells (pigment contained)
Mention if the following statement is true (T) or false (F) Give reason.
Short-sightedness and hyperopia are one and the same thing
Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The part of the eye which can be donated from a clinically dead person is the Retina.
Define the following:
Blind spot
Define the following:
Power of accommodation
Give the main function of the following:
Retina
Give the main function of the following:
Lachrymal glands
Choose the correct answer.
Aperture controlling passage to light into the eye is ___________
Give Technical Term:
Name the part of the retina on which an object is focused for the clearest vision.
Give Technical Term:
The nutritive layer of the eye which also presents reflection of light.
Mention, if the following statement is True or False
Rods are responsible for vision in the dark
State the Function:
Choroid coat in the eye
Choose the Odd One Out:
A small hole of changing diameter at the centre of Iris is called _______.
Write an Explanation.
Farthest distance of distinct vision
The muscular diaphragm that controls the size of the pupil is ____________.
Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?
______ is a transparent layer.
______ of the eye is comparable to the film of a camera.
The coloured portion of the eye is the ______.
Match the following
| 1. | Conjunctiva | a. | Coloured part of eye |
| 2. | Cornea | b. | Photosensitive layer |
| 3. | Iris | c. | Refraction |
| 4. | Retina | d. | Protection |
Select the option with incorrect identification:
With reference to human eye, answer the following question.
What is blind spot?
Explain the role of the part of human eye responsible for power of accommodation of human 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 |
State the functions of the following:
Ciliary muscles
