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Science_Lab_Yellow / Lesson 9: How Does the Eye Work

How Do Lenses Work

What will we be learning today?

  • In this lesson, we are going to learn all about how lenses work.

  • How Does the Eye Work?

    Each of your eyes has a convex lens that casts an image onto the back of the eye. Here a sheet of tissue called the retina converts the light into signals that nerves carry to the brain. Your brain then turns the nerve signals into your view of the world.



    The diagram shows how your eyes work. Light from an object reaches the eye and is refracted by the cornea. The refracted light then enters the eye through the pupil and travels to the lens.


    The lens of the eye bends the light even more, so that it forms an image on the retina.


    Images that form on the retina are sent on by the optic nerve to the brain. The brain then turns these images into your view of the world.




    Light bends as it travels from one kind of substance to another. You can use lenses to focus light and form various kinds of images. The cornea and lens of your eye act as lenses to focus light rays on the retina of your eye. Without this focusing ability, you would not be able to see things clearly.