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What is the shape of wavefront incident on slit in Fraunhofer single slit diffraction?

What is the shape of wavefront incident on slit in Fraunhofer single slit diffraction? Correct Answer Planar

Content: 

When a wave is obstructed by an obstacle, the rays bend around the corner. This phenomenon is known as Diffraction. The figure given below shows a basic arrangement for observing diffraction effects in light waves. So is a narrow source of light, G is a diffracting element and S is the screen. A special case of diffraction arises when the source, screen, and slit are very far from each other such that the rays appear to be parallel to each other. This special case of diffraction is called Fraunhofer Diffraction. 

                                Additional Information

If the source or the screen is at a finite distance from the diffracting element, it is called Fresnel Diffraction. 

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