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प्रश्न
State reasons for Myopia. With the help of ray diagrams, show the:
- image formation by a myopic eye, and
- correction of myopia using an appropriate lens.
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उत्तर
Myopia is a visual impairment in which a person can see all around objects clearly, but finds it difficult to comfortably focus on a single object. This eye is referred to as the myopia eye.
Myopia can be caused by:
- increase in curvature of the lens.
- increase in the length of the eye ball.
(a) A myopic eye's far point is close to that infinite distance. In front of the retina, it creates the separate object image depicted in the figure.
(b) Concave lens has an ability to diverge incoming rays, it is used to correct this defect of vision. The image is allowed to form at the retina by using a concave lens of suitable power as shown in the figure.
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संबंधित प्रश्न
Which defect of vision can be rectified:
by using a concave lens?
Name one defect of vision (or eye) which cannot be corrected by any type of spectacle lenses.
Differentiate between members of the following pair with reference to what is asked in bracket.
Myopia and hyperopia (cause of the defect)
Select the odd one in the following series:
Endolymph, Tympanic membrane, Semi-circular canal, Blind spot.
Given below is a diagram depicting a defect of the human eye? Study the same and answer the question that follow :
Name the type of lens used to correct this eye defect.
Give Reason:
When you enter into a dark room from bright because of sunlight, you can not see things for a few seconds.
Complete the following sentence with appropriate word :
An inability to focus on nearby objects due to loss of elasticity of the lens with age is called Iris.
The diagram given below represents the cross-section of the human eye:
(i) Name the parts labeled 1—12.
(ii) What is the function of the part marked ‘10’?
(iii) What would happen if part ‘5’ is damaged or cut?
Assertion: Myopia is the defect of vision in which a person cannot see distant objects clearly.
Reason: This due to eye-ball being too short.
Myopia may arise due to ____________.
