Question

A person cannot see objects clearly beyond 2.0 m the power of lens required to correct his vision will be what Diopters, explain with reason.

Answer 1

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$<font color= "Black"> This defect is myopia.</p><p>It can be defined is as follows.</p><p>The eye defect in which a person cannot see objects beyond near point or far objects but can see the near objects clearly is called Myopia.</p><p>The point of maximum distance at which the eye lens can form an image on the retina is called ' far point '</p><p>This defect can be corrected by using biconvex lens.</p><p></p><p>Given distance of far point (D) = 2m</p><p>Let f be the focal length of eye lens.</p><p>Image distance ( distance between eye lens and retina ) for our human eye is always constant and is about 2.5 cm.</p><p>This is due to the action of ciliary muscles.</p><p>applying lens formula, we get</p><p>f = -D</p><p>= -2 cm.</p><p>but , the power of a lens is reciprocal of focal length.</p><p>hence. Power = 1/f. ( f in meters )</p><p>= 1/-2</p><p>= - 0.5 dioptre.</p><p></p><p></p><p>$

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