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Q.

Range of vision of a normal human eye is from:


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a

100 m to 25 cm

b

1 km to 25 cm

c

Infinity to 25 m

d

Infinity to 25 cm 

answer is D.

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Detailed Solution

Concept: Amazing optical instrument in humans is the eye. The ability to see the world comes from the human eye's response to light. Light travels through the cornea to form an image in our eyes as the first step in the process. The iris regulates how much light is allowed to enter the eye through the pupil, which lets light into the eye. The light then travels through the lens of the eye before striking the retina. The retina of the human eye is where the image is formed, and it is inverted. Our brain sends electrical signals from the retina to the brain to correct the inverted image.
The range of vision for a typical human eye refers to the range of distances at which a clear image of an object can be obtained. An object's image needs to land precisely on the retina in order for a person to see it clearly. This implies that the image's distance must match the distance between the lens and the retina. However, because the distance between the lens and retina is fixed, the image distance is constant for all objects and distances. Our eyes are able to accomplish this by changing the strength of their lenses. Accommodation is the term for this process of adjusting, which involves altering the shape of our eyes' lenses.
The closest point to an object that can produce a clear image is known as the near point of the eye. The far point of the eye is the distance at which an object must be placed in order to be clearly visible from a great distance. The range of vision for an average human eye is 25 cm and infinity. The distance between the far and close focuses of the human eye is indicated here.
Hence, the correct option is 4.
 
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