Question

Observe the figure and answer the following questions: 

1. Name the defect of vision represented in the above figure. 
2. State the reasons for this defect. 
3. How is it corrected? 
4. Draw the diagram to show the correction of this defect.

Hint:

Myopia is corrected using concave lenses because these lenses diverge the incoming light rays, shifting the focal point onto the retina. Remember, concave lenses are thinner at the center than at the edges.

Answer 1

1. Name of the defect: The defect of vision shown in the figure is Myopia (or Near-sightedness). In this condition, a person can see nearby objects clearly but has difficulty seeing distant objects because the image of distant objects forms in front of the retina.
      
    
2. Reasons for this defect:
      Myopia occurs due to:
           - An eyeball that is too long.
           - A lens with too short a focal length.
   
      These factors cause light rays to converge too soon, before reaching the retina.
      
    
3. How is it corrected? Myopia is corrected with concave lenses (lenses that diverge light). These lenses spread the light rays before they enter the eye, allowing the rays to focus correctly on the retina.
      
    
4. Diagram to show the correction of myopia:
      [Insert a diagram here showing a concave lens diverging the rays of light before they enter the eye, ensuring the rays focus on the retina.]