Hello folks,
We were given a physics assignment today that we have to finish by this evening, and I need some help on how to approach it or solve the question.
The question is complete: What is the minimum distance between a screen and an object to produce a sharp image?
Thank you in advance for your help!
(1 votes)
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Wie Bildweite und Gegenstandsweite voneinender abhängen, das sagt die Linsengleichung:
1/f = 1/b + 1/g
https://www.leifiphysik.de/optik/optische-linsen/grundwissen/linsengleichungen
Da es (wegen des Schirms) nur um reelle Bilder geht, sind b und g beide positiv und beide >= f.
Bei g < 2f wird b > 2f. b wird schneller größer als g kleiner wird.
Ebenso, wenn b < 2f ist, dann wird g > 2f. g wird schneller größer als b kleiner wird.
Bei g = f wird b = ∞, und bei b = f wird g = ∞. Die Summe ist dann ∞.
https://www.leifiphysik.de/optik/optische-linsen/grundwissen/bildeigenschaften-bei-abbildungen
Näher als mit b = g = 2f bekommt man Gegenstand und Schirm nicht zusammen.
Dann ist b + g = ?