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Question

Difficulty: EasyThin Lenses, Optical Instruments, and Defects of Vision

Match each defect of vision on the left with its corresponding corrective optical lens on the right.

  • Myopia (Short-sightedness)Concave (diverging) lens
  • Hypermetropia (Long-sightedness)Convex (converging) lens
  • PresbyopiaBifocal lens
  • AstigmatismCylindrical lens

Answer

Myopia matches with Concave (diverging) lens, Hypermetropia matches with Convex (converging) lens, Presbyopia matches with Bifocal lens, and Astigmatism matches with Cylindrical lens.
Each eye condition is paired with its specific optical correction: Myopia requires a concave lens to diverge light, Hypermetropia requires a convex lens to converge light, Presbyopia uses a bifocal lens to assist diminished accommodation, and Astigmatism relies on a cylindrical lens to correct asymmetrical curvature.

Step-by-Step Solution

1
Analyze Myopia (Short-sightedness)
Parallel rays focus in front of the retina due to an elongated eyeball or over-refractive lens.
Diverging (concave) lenses spread out incoming rays slightly before entering the eye so the focal point shifts back onto the retina.
2
Analyze Hypermetropia (Long-sightedness)
Light rays focus behind the retina due to a shortened eyeball or insufficient focal power.
Converging (convex) lenses provide additional converging power to focus rays directly on the retina.
3
Analyze Presbyopia
The eye lens loses elasticity with age, reducing its power to accommodate both near and far objects.
Bifocal lenses have two distinct focal lengths in a single glass unit to assist with both near and distant vision.
4
Analyze Astigmatism
Cornea or crystalline lens curvature is uneven along different axes, producing distorted vision.
Cylindrical lenses correct uneven refractive power by bending light along one axis without affecting the orthogonal axis.

Key Concept

Defects of Vision and Corrective Lenses
Estimated Time:45s
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Topics

Thin Lenses, Optical Instruments, and Defects of Vision

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