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A long rectangular slab of transparent medium of thickness 'd' placed on a table with its length parallel to the x-axis and width parallel to the y-axis. A ray of light travelling in air makes a near normal incidence on the slab as shown. Taking the point of incidence as origin (0,0,0). The refraction index mu of the medium varies as mu = (mu_0)/(1 - (x/r)),where mu_1 andr( > d) are constants. The refractive index of air is m_0The subsequent path of the ray after it meets the upper surface of the slab air boundary is |
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Answer» the ray retraces its path |
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