Optics Question: Object Distance with a Slit and Lens

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When a slit is placed between a light source and a lens, the object distance is measured from the slit to the center of the lens. The slit acts as a new light source, influencing how light diffracts. Therefore, the object distance changes from the original light source to the slit. This adjustment is crucial for accurate optical calculations. Understanding this relationship is essential for analyzing diffraction effects in optics.
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Homework Statement


If I have a light source and a lens then I would take the object distance to be the distance between the center of the lens and the light source. But if I were to place a slit between the light source and the lens, would the object distance now be the distance between the slit and the center of the lens?

I think the object distance would change as the light diffracts out from the slit.
 
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Oerg said:
But if I were to place a slit between the light source and the lens, would the object distance now be the distance between the slit and the center of the lens?

Yes; the slit may be considered to be a light source in that situation.
 
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