Discuss the following types of wavefronts with emphasis on their sourceand shape along with sketches.() Plane wavefront(i) Cylindrical wavefront(i) Spherical wavefrontExplain the concept of diffraction of light with a neat sketch.In an experiment, two light waves have a wavelength of 561 nm each,They also have equal amplitude and equal phase. They enter medium 1(air) and medium 2 (transparent plastic layer). The medium 2 has arefractive index of 1.6. The thickness of both the media is 2.03 um.()Determine the phase difference of the emerging waves comingout of the media in wavelengths, radians, and degrees.(i) What is their effective phase difference (in wavelengths)?

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