CBSE Class 10 Science Chapter 11 - The Human Eye and Colorful World
Brief Information: In the previous chapter, we learnt about light and some of its properties. In this chapter, we will study some of the optical phenomena in nature. The chapter also discusses the rainbow formation, splitting of white light and blue colour of the sky. The human eye is one of the most valuable and sensitive sense organs. It enables us to see the wonderful world and the colours around us. The ability of the eye to focus on both near and distant objects, by adjusting its focal length, is called the accommodation of the eye. The smallest distance, at which the eye can see objects clearly without strain, is called the near point of the eye or the least distance of distinct vision. For a young adult with normal vision, it is about 25cm. The common refractive defects of vision include myopia, hypermetropia and presbyopia. Myopia, short-sightedness-the image of distant objects is focused before the retina is corrected by using a concave lens of suitable power. Hypermetropia (far-sightedness-the image of nearby objects is focussed beyond the retina) is corrected by using a convex lens of suitable power. The eye loses its power of accommodation at old age. The splitting of white light into its component colours is called dispersion. Scattering of light causes the blue colour of the sky and the reddening of the Sun at sunrise and sunset.
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