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Theory:

In the previous chapter, we have learned about the refraction of light by lenses. We also discussed the nature, position and relative size of images formed by lenses.
 
How can these concepts help us in the study of the human eye?
 
The human eye uses light and allows us to see objects around us. In its structure, the human eye has a lens.
 
Anatomy_and_physiology_of_animals_Structure_of_the_eye.jpg
Structure of the human eye
 
What is the function of the lens in the human eye?

How do the lenses use in spectacles rectify defects of vision?
 
Let us analyse all these questions in this chapter.
 
In the previous chapter, we have learnt about basics of light and some of its properties.
 
In this chapter, we shall use these concepts to study some of the optical phenomena in nature.