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Science and TechnologySEE 2082, Gandaki Province

A student sitting at the back of his class has difficulty in reading the letters on whiteboard placed on the front wall of the class room, but he can read his book easily. a) What type of defect of…

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A student sitting at the back of his class has difficulty in reading the letters on whiteboard placed on the front wall of the class room, but he can read his book easily. a) What type of defect of vision is he suffering from? [1] b) Draw ray diagrams to show the defect of his vision and remedy of the problem. [3] c) Write one cause of this defect of vision. [1]

Answer

· Based on the official syllabus and past papers
Updated

a) Type of defect of vision

The student is suffering from myopia (short-sightedness). In myopia, the eye focuses light in front of the retina instead of on it, causing distant objects (like the whiteboard) to appear blurry while nearby objects (like a book) remain clear.

b) Ray diagrams for myopia and its remedy

Explanation:

  • Left diagram: Shows how parallel rays from a distant object (whiteboard) converge in front of the retina, causing blurry vision.
  • Right diagram: A diverging (concave) lens is placed in front of the eye. This lens diverges the rays before they enter the eye, allowing them to focus correctly on the retina.

c) Cause of myopia

One common cause of myopia is excessive near work (e.g., prolonged reading or screen time without adequate rest). This causes the eye muscles to strain, leading to elongation of the eyeball and improper light focusing. Other causes include:

  • Genetic predisposition (family history of myopia).
  • Spending too much time indoors with insufficient exposure to natural light.
  • Improper posture while reading or using digital devices.

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