What is meant by power of accommodation of the eye?
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The ability of the eye lens to adjust its focal length is called power of accommodation of the eye. This enables us to see distant objects and nearby object clearly. A person with a myopic eye cannot see objects beyond 1. What should be the type of the corrective lens used to restore proper vision?
A person with a myopic eye should use a concave lens of focal length 1. What is the far point and near point of the human eye with normal vision? Ans : For a human eye with normal vision the far point myopia diagram class 10 at myopia diagram class 10 and the near point is at 25 cm from the eye.
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A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from?
Myopia myopia program
How can it be corrected? The student is suffering from myopia or short-sightedness. This defect can be corrected by using concave diverging lens of an appropriate power.
The human eye can focus objects at different distance by adjusting the focal length of myopia diagram class 10 eye lens. This is due to a Presbyopia b accommodation c near-sightedness d far-sightedness Ans : b accommodation. The human eye forms the image of an object at its a Cornea b iris c pupil d retina Ans: d retina. The least distance of distinct vision for a young adult with normal vision is about a 25 m b 2.
The change in focal length of an eye lens is caused by the action of the a Pupil b retina c ciliary muscles. A person needs a lens of power 5.
What is the focal length of the lens required for correcting i distant vision, and ii near vision? The far point of a myopic the person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Ans : To correct the myopia the person concerned should use concave lens diverging lens of suitable focal length. The near point of a hypermetropic eye is 1m.
Defects of Vision - Human Eye and Colorful World - Class 10 Physics
What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm. Convex lens of suitable focal length is used for correction of hypermetropic eye.
Why is a normal eye not able myopia diagram class 10 see clearly the objects placed closer than 25 cm? Ans: This is because the focal length of the eye lens cannot be decreased below a certain minimum limit that 25cm during accommodation.
What happens to the image distance in the eye when we increase the distance of an object from the eye? Ans : The image is formed on the retina even on increasing the distance of an object from the eye. When we increase the distance of an object from the eye lens becomes thinner and its focal length increases to focus image on retina.
Why do stars twinkle? Stars twinkle due to atmospheric refraction of starlight.
The látássérült gyermek gondozása of air varies place to place therefore, the path of rays of light coming from the star goes on varying slightly, the apparent position of the star formed randomly.
Thus, the stars twinkle.
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Explain why the planets do not twinkle. Planets are much closer to the earth so not much refraction occurs. Therefore, planets appear equally bright and there is no twinkling of planets. Ans : In the early morning, the sun is situated near the horizon. Light from the Sun passes through thicker layers of air and cover larger distance before reaching our eyes.
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