A person can see clearly up close, but cannot focus on objects beyond 86.0 cm .

Question

A person can see clearly up close, but cannot focus on objects beyond 86.0 cm . She opts for contact lenses to correct her vision.

A) Is she nearsighted or farsighted?

Is she nearsighted or farsighted?

She is farsighted.

B) What type of lens (converging or diverging) is needed to correct her vision?

C) What focal-length contact lens is needed ?

D) What is the power of the contact lens in diopters?

She is farsighted.

B) What type of lens (converging or diverging) is needed to correct her vision?

C) What focal-length contact lens is needed ?

D) What is the power of the contact lens in diopters?

Explanation / Answer

A)
since she can't see far object.
She is nearsighted

B)
In nearsighted, image is formed in front of retina. Lens should be Diverging lens.

C)
for this person, far object should be focussed at 86 cm. that is when object is at infinity, image should be formed at 86 cm
Clearly focal length = -86 cm

D)
P = 1/f =1/-0.86 m = 1.16 D

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