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A 14 year old student is not able to see...

A 14 year old student is not able to see clearly the questions written of the black board placed at a distance of 5 m from him.
Name the type of lens used to correct this defect?

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To solve the question regarding the type of lens used to correct the vision defect of a 14-year-old student who cannot see clearly at a distance of 5 meters, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Vision Problem**: The student is unable to see clearly at a distance of 5 meters. This indicates that he is experiencing difficulty in seeing distant objects. 2. **Determine the Type of Vision Defect**: ...
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Eye is a natural optical device by which human could see objects around him. It forms an inverted, real image on a light sensitive surface called retina. It works on the phenomenon of refraction of light through a natural convex lens. However, Sanjana was unable to see clearly the words written on the black board placed at a distance of approximately 3.5m from her. Her mother discussed the same with the doctor. Doctor explained her about this defect of vision and its correction. What kind of defect Sanjana is suffering from?

Eye is a natural optical device by which human could see objects around him. It forms an inverted, real image on a light sensitive surface called retina. It works on the phenomenon of refraction of light through a natural convex lens. However, Sanjana was unable to see clearly the words written on the black board placed at a distance of approximately 3.5m from her. Her mother discussed the same with the doctor. Doctor explained her about this defect of vision and its correction. Identify the possible cause of the defect from the following: