The far point of a myopic person is 80cm . What is the power of the lens required to enable him to see very distant objects clearly?

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Solution

For a Lens to correct myopic defect ;
u = -infinity
v = -80cm
f = ?

1/f = 1/v - 1/u
1/f = 1/(-80) + (1/-infinity)
1/f = -1/80 + (-0)
f = -80 cm
f = -0.8 m

Power = 1/f
= 1/(-0.8)
= -1.25
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The nature of lens required to see the distant objects clearly is convex lens is power -1.25

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