An eye condition is corrected using a +4.0D lens.
Which eye condition could be corrected by using this lens?
astigmatism
hypermetropia
myopia
Calculate the magnification produced by the +4.0D lens when viewing an object 75 cm from this lens.
Figure 1 shows a diagram of an eye.
Figure 1

State the name and primary optical function of X, Y and Z.
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