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

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
by

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Answer :

B. source of light is kept at finite distance from the aperture
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When light enters a closed room through a small hole in the door, the image of an outside building appears as inverted on the opposite wall. This is because (a) The hole acts as a convex lens (b) Light takes curvature at the edges of the hole (c) Of rectilinear propagation of light (d) The hole acts as a concave lens

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