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April 18, 2014

Homework Help: Physics

Posted by Kyle on Monday, May 28, 2012 at 8:27pm.

Ordinary glasses are worn in front of the eye and usually 2.00 cm in front of the eyeball. A certain person can see distant objects well, but his near point is 60.0 cm from his eyes instead of the usual 25.0 cm. Suppose that this person needs ordinary glasses.

What focal length lenses are needed to correct his vision ?

Here's my work so far:

I think that since the near point is 60cm, the image should be at 60cm from the lens, but since the lens is worn 2cm from the eye, the focal length should be 60-2 so 58cm, right?

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