Our eyes are amazing, but sometimes they need a little help to focus light correctly. This lab activity explores how lenses, like those in glasses or contacts, can correct common vision problems such as nearsightedness (myopia) and farsightedness (hyperopia). By understanding how different lenses bend light, we can see how they compensate for the eye's focusing errors, resulting in clearer vision. Let's get started!
Match the term with its correct definition:
| Term | Definition |
|---|---|
| 1. Myopia | A. A lens that is thinner in the middle and thicker at the edges. |
| 2. Hyperopia | B. The ability of the eye to change its focus from distant to near objects. |
| 3. Concave Lens | C. A lens that is thicker in the middle and thinner at the edges. |
| 4. Convex Lens | D. A condition where distant objects appear blurry. |
| 5. Accommodation | E. A condition where near objects appear blurry. |
Correct Matches: 1-D, 2-E, 3-A, 4-C, 5-B
Complete the following paragraph using the words provided: focal point, retina, nearsightedness, lens, farsightedness.
The eye focuses light using the _____. In a person with _____, the light focuses in front of the _____, causing blurry vision for distant objects. Conversely, in _____, the light focuses behind the retina, causing blurry vision for near objects. The point where light converges is called the _____.
Answer: The eye focuses light using the lens. In a person with nearsightedness, the light focuses in front of the retina, causing blurry vision for distant objects. Conversely, in farsightedness, the light focuses behind the retina, causing blurry vision for near objects. The point where light converges is called the focal point.
Explain how a concave lens helps correct nearsightedness. Use a diagram to support your explanation.
A concave lens is thinner in the middle than at the edges. When placed in front of a nearsighted eye, it diverges incoming light rays before they enter the eye. This divergence causes the light to focus further back, directly onto the retina, correcting the blurry vision. A diagram would show parallel light rays entering the concave lens, diverging, and then converging on the retina.
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