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Mindmap: Ray Optics: The Human Eye & Colorful World | Science Class 10 PDF Download
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FAQs on Mindmap: Ray Optics: The Human Eye & Colorful World - Science Class 10
| 1. What is the structure of the human eye? |  |
Ans. The human eye is a complex structure consisting of various parts. These include the cornea, iris, pupil, lens, retina, and optic nerve. The cornea and lens help in focusing light onto the retina, which contains light-sensitive cells called rods and cones. The optic nerve transmits visual information from the retina to the brain.
| 2. How does the human eye perceive colors? | |
Ans. The human eye perceives colors through a process called trichromacy. This means that there are three types of cones in the retina that are sensitive to different wavelengths of light. These cones are responsible for detecting red, green, and blue colors. The combination of signals from these cones allows the brain to perceive a wide range of colors.
| 3. What is the difference between nearsightedness and farsightedness? | |
Ans. Nearsightedness, also known as myopia, is a condition where objects in the distance appear blurry, while nearby objects are clear. This occurs when the eyeball is longer than normal or the cornea is too curved. On the other hand, farsightedness, or hyperopia, is a condition where nearby objects appear blurry, while distant objects are clear. This happens when the eyeball is shorter than normal or the cornea is not curved enough.
| 4. How does the eye adjust its focus to see objects at different distances? | |
Ans. The eye adjusts its focus through a process called accommodation. This is done by changing the shape of the lens. When looking at distant objects, the lens becomes flattened, allowing light to focus directly on the retina. For close objects, the lens becomes thicker and rounder, increasing its refractive power and bringing the image into focus on the retina.
| 5. What causes color blindness? | |
Ans. Color blindness is usually caused by a genetic mutation that affects the functioning of the cones in the retina. The most common type of color blindness is red-green color blindness, where individuals have difficulty distinguishing between red and green colors. This condition is more common in males and is inherited from their mothers. In rare cases, color blindness can also be caused by certain eye diseases or as a side effect of certain medications.
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