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In an experiment with a rectangular glass slab, a student observed that a ray of light incident at an angle of 55° with the normal on one face of the slab, after refraction strikes the opposite face of the slab before emerging out into air making an angle of 40° with the normal. Draw a labelled diagram to show the path of this ray. What value would you assign to the angle of refraction and angle of emergence?  

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Best answer

OA - incident ray

i is angle of incidence = 45°

Given r2 = 40°

r2 and r2 are alternate interior angles,

∴  ∠r1 = ∠r2 = 40°

So, angle of refraction = 40°

Since, the emergent ray is parallel to the incident ray, the angle of emergent must be equal to angle of incidence,i.e  ∠e = ∠ i = 55°

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