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A pair of glasses is designed for a person with a far-point distance of 4 m...

A pair of glasses is designed for a person with a far-point distance of 4 m so that she can read street signs 19.5 m away. (The far-point distance is the distance from the eye at which you are just able to properly focus a distant object.)

(a) If the glasses are to be worn 1.0 cm from her eyes, what is the needed focal length? Answer: -5.02 m

(b) Compare this focal length (find the percent difference) to the focal length she would need if she chooses a style of glasses that fit on her face so that the lenses are instead 2.0 cm away from her eyes.

Part B only please!

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