A student uses spectacles of focal length - 2-5 m.(a) Name the defect of vision he is suffering from.(b) Which lens is used for the correction of this defect?(c) List two main causes of developing this defect.(d) Compute the power of this lens.

A student uses spectacles of focal length - 2-5 m.(a) Name the defect

1.	A student uses spectacles of focal length - 2-5 m.(a) Name the defect of vision he is suffering from.(b) Which lens is used for the correction of this defect?(c) List two main causes of developing this defect.(d) Compute the power of this lens.
Answer» (a) since it is -2 - 5 m. THUS, he is suffering from MYOPIA(b) CONCAVE lens is used to CORRECT this defect.(c) i-excessive curvature of cornea. ii-elongation of EYEBALL.(d) the power of this lens is - 0.5 - 0.2d

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A student uses spectacles of focal length - 2-5 m.(a) Name the defect of vision he is suffering from.(b) Which lens is used for the correction of this defect?(c) List two main causes of developing this defect.(d) Compute the power of this lens.​

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A student uses spectacles of focal length - 2-5 m.(a) Name the defect of vision he is suffering from.(b) Which lens is used for the correction of this defect?(c) List two main causes of developing this defect.(d) Compute the power of this lens.