A ray of light is incident on a glass slab at grazing incidence. The refractive index of the material of the slab is given by `mu =sqrt(1+sqrty) `. If the thickness of the slab is d, determine the equation ofthe trajectory of the ray inside the slab and the coordinates of the point where the ray exits from the slab. Take the origin to be at the point of entry of the ray.

Explanation

To solve the problem step by step, we will analyze the situation of a ray of light incident at grazing incidence on a glass slab and derive the trajectory of the ray inside the slab, as well as the coordinates of the exit point.

### Step 1: Understand the Geometry
The ray of light is incident at grazing incidence, which means it strikes the surface of the glass slab at an angle of 90 degrees. The refractive index of the glass slab is given by:

\[ \mu = \sqrt{1 + \sqrt{y}} \]
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