Light and Lenses Light passes into the eye through a lens. A lens works a bit like a magnifying glass. When you look through a magnifying glass, it makes things very clear. In the same way, the lens focuses light so the image that we see is clear. It focuses the image onto the retina. The retina is the surface at the back of the eyeball. The image that the lens sends to the retina is upside down. The brain turns it the right way up, so we know what we are looking at! Messages to the Brain The retina sends messages about what your eyes see to your brain. First, it changes the colors and shapes in the image into millions of signals. Then, it sends these signals to the brain along a pathway called the optic nerve. The brain figures out what the signals mean. Lens and Distance Look away from this book and focus on something far away. You will not feel it, but the shape of your lenses changes. The lens becomes thinner when the eye looks at things close-up, and it becomes thicker when the eye looks at things far away.

Informational text often includes text features such as headings and boldfaced words. Informational text usually includes one or more graphic features such as photographs, diagrams, and illustrations.


1. How does the diagram connect to the text in the caption?


2. How does the diagram add to your understanding of the ideas in the text at the top of page 14?



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