Name the four common defects of vision and state the cause of each defect. A person cannot see distinctly objects placed beyond 2 metres. State the nature and focal length of the lens which could be used to correct this defect.OR(a) Describe with diagram an experiment to show that a force is exerted on a current carrying conductor when placed perpendicular in a magnetic field.(b) State the rule to find the direction of the force exerted on a current carrying conductor in a magnetic field.
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1. Myopia - Causes - a. elongation of eyeball b. excessive curvature of eyelens.
2. Hypermetropia - Causes - a. Shortening of eyeball b. when the focal length of cornea increases.
3. Presbyopia - Causes - a. Due to oldage
4. Cataract - Causes - a. when eyelens becomes hazy
The person is suffering from myopia. Concave lens will be used.
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