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In Fresnel diffraction A. source of light is kept at infinite distance from the aperture B. source of light is kept at finite distance from the aperture C. Convex lens used D. aperture width is selected so that it can acts as a point source

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In Fresnel diffraction  
A. source of light is kept at infinite distance from the aperture  B. source of light is kept at finite distance from the aperture  C. Convex lens used
D. aperture width is selected so that it can acts as a point source
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B. source of light is kept at finite distance from the aperture
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