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Light Reflection and Refraction
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02/12/2020 12:38 pm
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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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02/12/2020 12:45 pm
OA - incident ray
i is angle of incidence = 55°
Given r2 = 40°
r1 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°