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Optical Physics question concerning mirrors and observers !


hitmankratos

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Basically, what I want to know is, how can I determine the minimal mirror's length so that the observer (blue smiley) can see the whole reflected image (reversed moon)?

 

 

You have to look at the angle it subtends, how far away it is and how big it appears to be (2 of those determine the third). (as an example, you should be able to show that to observe yourself, at length L, the mirror needs to be at least L/2, because of the location of the image)

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