Question
If a near-sighted person cannot see objects clearly
beyond 1.2 meters, what should be the focal length of the concave lens required for correction?Solution
Sol. For a person with myopia (near-sightedness), the focal length of the concave lens should equal the farthest distance at which the person can see clearly. Here, the required focal length is 1.2 meters. Information Booster:
- Myopia is corrected using a concave lens.
- It occurs due to an elongated eyeball or a steep cornea.
- Concave lenses help focus light farther away.
- Commonly develops during childhood.
- Proper eyeglasses or contact lenses help correct the vision.
- 1.5 m: Suitable for moderate myopia.
- 2.2 m: Can apply to hyperopia cases.
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