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प्रश्न
Given below is a diagram depicting a defect of the human eye. Answer the questions that follow:
- Give the scientific term for the defect.
- Mention one possible reason for the defect.
- What type of lens can be used to correct the defect?
उत्तर
- Myopia (short-sightedness)
- There are two possible reasons for myopia one is the eyeball is lengthened from front to back and the other is the lens is too curved. Both these reasons might as well occur together.
- Myopia can be corrected by using a suitable concave (diverging) lens which causes the light rays to diverge before they strike the lens of the eye.
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संबंधित प्रश्न
Write the function of retina in human eye.
How does the eye regulate the amount of light that falls on the retina?
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?
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.
What is the name of:
the light-sensitive layer in the eye?
What changes the shape of lens in the eye?
Give the scientific names of the following parts of the eye:
carries signals from an eye to the brain.
Which of the following controls the amount of light entering the eye?
(a) ciliary muscles
(b) lens
(c) iris
(d) cornea
Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
Name two animals having eyes:
one the sides of the head.
Give the main function of the following:
Retina
Sketch and label V.S. of a human eye.
What happens to the image distance in the normal human eye when we decrease the distance of an object, say 10 m to 1 m? Justify your answer.
Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.
Name the following:
The region in the eye where the rods and cones are located.
Mention, if the following statement is True or False
Rods are responsible for vision in the dark
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
In human eye the part which allows light to enter into the eye is ______.
Name the following:
Three layers of the eye ball.
