Answer
(a) Ellen is nearsighted.
(b) Her far point without the glasses is $~~1.0~m$
Work Step by Step
(a) The prescription has a negative value. This means that the lens is a diverging lens. Therefore, Ellen is nearsighted.
(b) We can find the location of the image:
$P = \frac{1}{s}+\frac{1}{s'}$
$\frac{1}{s'} = P - \frac{1}{s}$
$\frac{1}{s'} = -1.0~m^{-1} - \frac{1}{\infty}$
$\frac{1}{s'} = -1.0~m^{-1}$
$s' = -1.0~m$
Her far point without the glasses is $~~1.0~m$