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Any smart cookie help me answer this optics/focal length question?

ilovegeeks
in Classical Physics

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I'm really stuck, I've been doing questions all day so I think my poor brain is just a bit frazzled. Any help will be much appreciated!<br style="color: rgb(51, 51, 51); font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px; "><br style="color: rgb(51, 51, 51); font-family: arial, helvetica, clean, sans-serif; font-size: 13px; line-height: 16px; ">Thanks for all your time

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