Fresnel diffraction is produced due to light | vedclass

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(B) In Fresnel diffraction,the source of light and the screen are at finite distances from the obstacle. No lenses are required to render light rays p

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the number of half-period zones that superpose at the point

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(B) In Fresnel diffraction,the source of light and the screen are at finite distances from the obstacle. No lenses are required to render light rays parallel. The diffraction pattern observed on the screen is formed by the superposition of secondary wavelets originating from different parts of the wavefront. The resultant amplitude and intensity at any point on the screen depend on the number of half-period zones that contribute to the superposition at that specific point. If the number of zones is odd,the point may be bright,and if even,it may be dark,depending on the phase interference.

Process	Condition
$(I)$ Adiabatic	$(A)$ $\Delta W = 0$
$(II)$ Isothermal	$(B)$ $\Delta Q = 0$
$(III)$ Isochoric	$(C)$ $\Delta U \neq 0, \Delta W \neq 0, \Delta Q \neq 0$
$(IV)$ Isobaric	$(D)$ $\Delta U = 0$

Fresnel diffraction is produced due to light rays falling on a small obstacle. The intensity of light at a point on a screen beyond an obstacle depends on

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