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dvernet

Was this slide every corrected? If I remember correctly the rays from $Z$ should actually cross before the sensor plane, right?

Edit: hmm nevermind, from this diagram is looks like the rays would cross before the sensor plane if $Z$ was further from the lens than $Z_{f}$ so the slide is correct.

lucida

This slide also explains how myopia (or near sightedness works). A nearsighted eye is longer than a normal eye, moving the sensor plane, i.e. the retina, farther back. This makes the focal length longer, so objects need to be closer to come into focus.