18. What happens to the image produced by a lens if the lens is stopped down (the aperture reduced, thereby reducing the amount of light passing through the lens) with an iris diaphragma device that covers its periphery?
Indicate which chapter and question you are working on.
You will need to write one paragraph composed of at least two well-formed sentences.
You will also need to comment on two other student’s submissions. Each comment should be at least one complete sentence.
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