1. Read the following statements. 1) In Myopia the image of an object is formed in front of the retina. (2) Spectacles with convex lenses are used for correcting the defect in Myopia. (3) In Hypermetropia image of an object is formed behind of the retina. (4) Spectacles with concave lenses are used for correcting the defect in Hypermetropia. Which of the statements related to defects of vision given above are correct? (a) (1) & (2) (b) (2) & (3) (c) (3) & (4) (d) (1) & (3)
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Answer:
Answer is D) 1 & 3
Explanation:
1. The first statement is true as in Myopia, the converging power of the lens increases thus creating image in front of the retina.
2. Second statement is false because Concave lens is used to correct Myopia or Short sightedness.
3. Third statement is true as in Hypermetropia, the converging power of lens decreases this creating image behind the retina.
4. Fourth statement is false as Convex lens is used to correct Hypermetropia or Long sightedness.
Therefore correct statements are 1 & 3.
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Of the statements related to defects of the vision given above (d) (1) & (3) are correct.
- Nearsightedness is medically referred to as myopia. This is a refractive eye disorder in which a person sees objects up close but blurs them when they are far away because an image of an object is formed in front of the retina.
- Farsightedness is medically referred to as hypermetropia. This is a refractive eye disorder in which the person cannot see nearby objects clearly but can easily see far objects because an image of an object is formed behind the retina. Hence, options (d) (1) & (3) are correct.
- Spectacles with concave lenses are used for correcting the defect in Myopia. Spectacles with convex lenses are used for correcting the defect in Hypermetropia.
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