Trivia: Human Eye And The Colourful World! Quiz

Myopia, also known as nearsightedness, is a common vision defect where a person can see nearby objects clearly but has difficulty seeing distant objects. This occurs when the eyeball is slightly longer than normal or the cornea is too curved, causing light rays to focus in front of the retina instead of on it. As a result, distant objects appear blurry.

Refraction of light is the correct answer because when light passes through the Earth's atmosphere, it undergoes refraction, which causes the light rays to bend. This bending of light makes the stars appear higher in the sky than they actually are. Refraction occurs due to the variation in the density of the Earth's atmosphere, causing the light to change direction as it passes through different layers. This phenomenon is responsible for the apparent displacement of celestial objects, making them appear higher or lower in the sky than their actual position.

The term "accommodation" as applied to the eye refers to its ability to vary the focal length of the lens. This means that the eye can adjust the shape of the lens to focus on objects at different distances. When focusing on near objects, the lens becomes more rounded, increasing its refractive power. When focusing on distant objects, the lens becomes flatter, decreasing its refractive power. This adjustment in the lens shape allows the eye to maintain clear vision at different distances.

With both eyes open, a person's field of view is about 180 degrees horizontally and about 120 degrees vertically. This is because each eye has a field of view of about 90 degrees horizontally, and the fields of view from both eyes overlap, creating a wider overall field of view. The vertical field of view is slightly smaller due to the position and shape of the eye sockets.

When a beam of white light passes through a glass prism, it undergoes dispersion, meaning that the different colors of light are separated. This is because different colors of light have different wavelengths and therefore different speeds in the prism. The color that undergoes the least bending is red. This is because red light has a longer wavelength compared to the other colors of light. As a result, red light is refracted the least and deviates the least from its original path.

No dispersion will take place when sunlight passes through a medium that has a uniform refractive index for all wavelengths of light. This means that the speed of light is the same for all colors of light as they pass through the medium. When the refractive index is the same for all wavelengths, there is no bending or separation of the different colors of light, resulting in no dispersion.

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The correct answer indicates the correct order of the eye conditions in terms of their visual characteristics. The normal eye has normal vision and does not require corrective lenses. The hypermetropic eye is farsighted, meaning it has difficulty seeing objects up close and may require reading glasses. The myopic eye is nearsighted, meaning it has difficulty seeing objects far away and may require distance glasses or contact lenses. Therefore, the correct order is the normal eye, the hypermetropic eye, and the myopic eye.

The lens in the eye changes its shape to focus on near or distant objects. When focusing on near objects, the lens becomes thicker, allowing it to refract light more strongly and bring the image into focus on the retina. Conversely, when focusing on distant objects, the lens becomes thinner, causing less refraction and allowing the image to be focused on the retina. This adjustment in the lens shape enables the eye to accommodate and provide clear vision at different distances.

The man finding it difficult to read the odometer but being able to clearly read a distant road sign suggests that his near point has receded away. This means that the closest distance at which he can focus his eyes has increased, making it harder for him to see objects up close.

Having two eyes facilitates in increasing the field of view, bringing a three-dimensional view, and developing the concept of distance/size. This is because having two eyes allows for binocular vision, which means that each eye sees a slightly different image. The brain then combines these two images to create a single, three-dimensional perception of the world. Additionally, having two eyes also increases the field of view, as each eye has its own visual field. This allows for a wider range of vision and better detection of objects in the environment. Finally, having two eyes helps in developing the concept of distance and size, as the brain uses the slight differences in the images received by each eye to perceive depth and accurately judge the distance and size of objects.

Both statement A and B are true.

Statement A accurately describes astigmatism, which is a refractive error that occurs when the cornea or lens of the eye has an irregular shape, causing blurred or distorted vision in both horizontal and vertical lines.

Statement B is also true, as stars twinkle due to the refraction of their light in the fluctuating atmosphere. When starlight passes through Earth's atmosphere, it encounters variations in temperature, humidity, and density, causing the light to bend and scatter, resulting in the twinkling effect we observe.

The sky appears blue because the blue component of sunlight is scattered by gas molecules present in the air. This scattering occurs when the light waves interact with the gas molecules and get redirected in different directions. Since blue light has a shorter wavelength, it is scattered more than other colors, making the sky appear blue. Dust particles, water droplets, and soot particles also scatter light, but they do not play a significant role in the blue color of the sky.

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The person is having a defect of vision called myopia. Myopia, also known as nearsightedness, is a condition where a person can see objects that are close to them clearly, but objects that are far away appear blurry. The optician's prescription indicates that the person's left eye has a power of -3 D, which means that the eye needs a concave lens to correct the vision. Similarly, the right eye has a power of +3.50 D, indicating the need for a convex lens to correct the vision. This prescription is typical for someone with myopia.