What happens to the image when you block the lower half of the lens?
The lower half of the image is blocked, so you can't see the point of the arrow.
The upper half of the image is blocked, so you can't see the tail of the arrow.
The entire image gets slightly dimmer, but you can still see everything.
Nothing at all happens to the image until you block the entire lens.
Is this quiz going to affect my final grade? Because the syllabus for this blog doesn't say anything about quizzes, so I don't think it's fair to start asking us stuff now...
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