a person\'s right eye is corrected to have the normal far point to affinity (1)

Question

a person's right eye is corrected to have the normal far point to affinity (1) by using a contact lens of power -0.25 D.
A) is this nearsighted, farsighted, or astigmatic
B) what is the eye's far point without he lens in place? a person's right eye is corrected to have the normal far point to affinity (1) by using a contact lens of power -0.25 D.
A) is this nearsighted, farsighted, or astigmatic
B) what is the eye's far point without he lens in place?
A) is this nearsighted, farsighted, or astigmatic
B) what is the eye's far point without he lens in place?

Explanation / Answer

since power is - negative, this must be a farsighted ness

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here object distasnce u = 25 cm

focal length = 1/P = 1/0.25 = 4m   = 400 cm

so

now use the relation for focal length as 1/f = 1/u +1/v

so

f = uv/(u-v)

f= 400 * 25/(400-25)

f = 26.67 cm

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