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You have studied in the previous chapter about refraction of light by lenses
and also about the nature, position and relative size of images formed by
lenses. How can these ideas help us in the study of the human eye? The human eye
uses light and enables us to see objects around us. How is an image formed on
the retina of an eye? How do the lenses used in spectacles correct defects of vision? Let us consider these questions in this chapter.
In this chapter, we shall also study some of the optical phenomena in nature
like splitting of white light, formation of rainbow, and blue colour of the sky.
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