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Explain the disease of human eye And why star are twinkle and planet not |
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Answer» There r four defects of eye that is astigmatism in which horizontal and vertical lines r not visible... Presbyopia on which both distant and near by objects r not visible.. Myopia in which far away objects r not visible and hypermetropia in which near by objects r not visible. Stars r a point source of light and very far away from us. When light travels in the atmosphere, it is scattered by different amounts.. Sometimes atmosphere scatter more light and sometimes less light. This continuous brighter and dimming effect make the stars to twinkle whereas planets r a collection of point sources of light and nearer to us. The dimming effect caused by one part of plant is nullified by the brightening effect of another part. Thus, planets do not twinkle but star does. That\'s why planet doesn\'t twinkle Human eye can have diseases like myopia..hypermetropia...presbyopia...cataract Presbyopia, myopia,hypermeteropia,astigmatism.because they are near from earth so their light refract least |
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