The condition for observing Fraunhofer diffraction from a single slit is that, the wave front incident on the slit should be,

Spherical

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Cylindrical

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Plane

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Elliptical

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Solution

The correct option is C Plane
In Fraunhofer diffraction, the source is at a far position (infinite distance) from the slit so that the wave front will be plane.

Hence, $(C)$ is the correct answer.

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The condition for observing Fraunhofer diffraction from a single slit is that, the wave front incident on the slit should be,

The correct option is C PlaneIn Fraunhofer diffraction, the source is at a far position (infinite distance) from the slit so that the wave front will be plane. Hence, (C) is the correct answer.

The correct option is C Plane
In Fraunhofer diffraction, the source is at a far position (infinite distance) from the slit so that the wave front will be plane.

Hence, $(C)$ is the correct answer.