Accommodation and Diopters Range for Bifocal Optics

[der.physika]

Homework Statement

A woman is wearing bifocals that have one-half of the lens with a power of -1.2 D and the other with a power of 1.8 D. A lens provides her with a far point set at infinity and other will give her a near point of 25 cm.

Where are her near point and far point WITHOUT her glasses?

What is her power of accomodation, what is therefore the range in which her Diopters can change?

Homework Equations

1/f = 1/V + 1/B

The Attempt at a Solution

do I just use the near point and far point equations for the first one?

 

[Mindscrape]

Yeah, this is basically just two problems in one. I do have to admit though, I don't know what power of accomodation is. I could maybe learn about it if you get stuck. Give it a try.