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A boy uses spectacles of focal length – 50cm. Hence the defect of vision, he is suffering from-
- a)Myopia
- b)Far-sightedness
- c)Hypermetropia
- d)Presbyopia.
Correct answer is option 'A'. Can you explain this answer?
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A boy uses spectacles of focal length – 50cm. Hence the defect o...
The boy is suffering from myopia. The focal length of a lens is a measure of the curvature of the lens, and it is used to describe the ability of the lens to focus light. A lens with a negative focal length, such as the one described in the question (-50 cm), is concave, which means that it is thinner in the middle than at the edges. A concave lens is used to correct for myopia, which is a type of vision defect that occurs when the eye is too long or the cornea is too steep, resulting in difficulty seeing objects that are far away. A lens with a positive focal length, on the other hand, is convex and is used to correct for hypermetropia, which is a type of vision defect that occurs when the eye is too short or the cornea is too flat, resulting in difficulty seeing objects that are close up. Far-sightedness, which is also known as hypermetropia, and presbyopia are other types of vision defects that are not related to the lens described in the question.
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A boy uses spectacles of focal length – 50cm. Hence the defect o...
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A boy uses spectacles of focal length – 50cm. Hence the defect of vision, he is suffering from-a)Myopiab)Far-sightednessc)Hypermetropiad)Presbyopia.Correct answer is option 'A'. Can you explain this answer?
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