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The refractive index of a medium changes...

The refractive index of a medium changes as`mu=mu_(0)[1-(x^(2)+y^(2))/(d_(2))]^(1//2)`where `mu_(0)` is the refractive index on the z axis. A plane wavefront (AB) is incident along z axis as shown in the figure. Draw the wavefront at a later time` Deltat`. Is the wavefront getting focused?

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`(##IJA_PHY_V02_C14_E01_035_A01##)` yes the wavefront is getting focussed.
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