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A person can see clearly up close, but cannot focus on objects beyond 82.0cm . She opts for contact lenses to corre...

A person can see clearly up close, but cannot focus on objects beyond 82.0cm . She opts for contact lenses to correct her vision.


Part A
Is she nearsighted or farsighted?
Part B
What type of lens (converging or diverging) is needed to correct her vision?
Part C
What focal-length contact lens is needed ?
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Answer #1

As she cannot focus on distant objects so she is near sighted. Diverging lens is needed to correct her vision. Use the following equation to calculate the focal length. Here, the virtual image of the object is at infinity and is formed at the far point 82 cm in front of the eye. Then when the object distance is s=infinity, the image distance SI-82 cm oo -82.0 cm 82.0 cm 82.0 cm The power of the lens in diopters is, 0 1 power =-=- f -0.82 m =-1.22 diopters

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