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Question

They x-y plane is the boundary between two transparent media. Medium-1 with z > 0 has refractive index 2 and medium-2 with z < 0 has a refractive index 3. A ray of light in medium - 1 given by the vector A=63ˆi+83ˆj10ˆk is incident on the plane of separation. If the unit vector in the direction of refracted ray in medium-2 is 10x3. Then x is :

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Solution

Since, the refractive index is changing only along the z-axis, therefore, the velocity will also change only along the z-direction.

Hence, the components along the x and y direction remain the same.

Along z direction,

v2v1=μ1μ2

Substituting for the values,

v2=10×23

Therefore, x=2.

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