Which one of the following combinations of source and screen would produce sharpest shadow of an opaque object?

Asked in UPSC CDS 2 2020 · Topic: Optics (Diffraction: Fraunhofer and Fresnel diffraction, diffraction grating)

1. A point source and an opaque screen
2. An extended source and an opaque screen
3. A point source and a transparent screen
4. An extended source and a transparent screen

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