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प्रश्न
उत्तर
human eye :
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संबंधित प्रश्न
Explain the following:
Mechanism of generation of light-induced impulse in the retina.
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 spectacle lenses will converge light rays or diverge light rays.
Out of rods and cones m the retina of your eye:
which detect colour?
What do the ciliary muscles do when you are focusing on a nearby object?
Fill in the following blank with suitable word:
The iris controls the amount of................entering the eye.
Fill in the following blank with suitable word:
To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made..........
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
Which of the following changes occur when you walk out of bright sunshine into a poorly lit room?
(a) the pupil becomes larger
(b) the lens becomes thicker
(c) the ciliary muscle relaxes
(d) the pupil becomes smaller
What shape are your eye-lenses:
when you look at your hand?
What is presbyopia? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
Fill in the following blank with suitable word:
Having two eyes enables us to judge.................more accurately.
Five persons A, B, C, D and E have diabetes, leukaemia, asthma, meningitis and hepatitis, respectively.
Which of these persons can donate eyes?
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Cones : Iodopsim :: Rods : ______.
What is a lacrimal gland?
Mention, if the following statement is True or False
Rods are responsible for vision in the dark
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.
Draw the struture of human eye and label its parts.
In a myopic eye, the image of the object is formed
Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?
