Defination of cylindrical wavefront
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When the source of disturbance is a slit (i.e. line source) then the wavefront is cylindrical because all the points are equidistant from the source and they lie on the surface of the cylinder.
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CYLINDRICAL WAVEFRONT: If the source of disturbance is a slit (i.e. line source) then the wavefront is cylindrical because all the points equidistant from the source lie on the surface of the cylinder (OR) When the source of light is linear, all the points equidistant from the linear source lie on the surface of a cylinder. Such a wavefront is called a cylindrical wavefront.
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