A narrow beam of light is incident at $53^{\circ}$ angle made with normal on a glass plate of refractive index $1.6$ . If the thickness of the plate is $20 m m$ . Calculate the shift of the beam.

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A narrow beam of light is incident at $53^{\circ}$ angle made with normal on a glass plate of refractive index $1.6$ . If the thickness of the plate is $20 m m$ . Calculate the shift of the beam.