A person with myopia, or near-sightedness, who cannot see objects beyond 1.2 meters distinctly, requires corrective lenses to improve their vision. The appropriate type of lens for this condition is a concave lens, also known as a diverging lens. These lenses help by diverging the light rays before they enter the eye, effectively moving the focus point backward onto the retina, thereby restoring clear vision for distant objects.

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Correcting Myopia: Understanding the Solution

Myopia: A Brief Overview: Myopia, commonly known as near-sightedness, is a vision condition where a person sees nearby objects clearly but struggles with distant vision. In myopia, distant objects appear blurry because the image is focused in front of the retina, not on it.

The Cause of Myopia

This condition often arises due to the elongation of the eyeball or an excessive curvature of the eye’s lens. These structural changes cause light rays to converge too soon, resulting in a blurred image of distant objects.

The Role of Corrective Lenses

To correct myopia, specific lenses are required that alter the path of incoming light rays, ensuring they focus correctly on the retina. The type of lens used for this purpose is crucial for effective correction.

Concave Lenses for Myopia

For a person with myopia who cannot see beyond 1.2 meters, concave lenses, also known as diverging lenses, are the ideal choice. These lenses spread out the light rays before they enter the eye, extending the focal length to align with the retina.

How Concave Lenses Work

When placed in front of a myopic eye, a concave lens diverges incoming light rays. This divergence adjusts the focal point, moving it from in front of the retina to directly onto it, thereby clarifying the image of distant objects.

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Achieving Clear Distant Vision
By using concave lenses, individuals with myopia can experience clear distant vision. These lenses are a simple yet effective solution, enabling myopic individuals to engage in everyday activities like driving, watching movies, or enjoying scenic views without visual impairment.

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Questions of 10th Science Chapter 10 in Detail

What is meant by power of accommodation of the eye?
A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
What is the far point and near point of the human eye with normal vision?
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?
The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect?
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
What happens to the image distance in the eye when we increase the distance of an object from the eye?
Why do stars twinkle?
Explain why the planets do not twinkle?
Why does the sky appear dark instead of blue to an astronaut?