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Really struggling to answer a practice exam question on the eye, and was wandering if anyone could help, heres the question:

"The unaided eye of a student has a power of 59.0D when viewing an object at infinity. When using her spectacle lens, the near point is 25cm from her eye.

Calculate the distance of the near point for her unaided eye.

The power of the student's glasses lens is 1.5D"

I do have the markscheme however I'm very confused as to how they have got their answer.

Thanks in advance,

Ed