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Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction2 Marks
Question
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?
✓

Answer



OA - Incident ray
Given r2 = 40º
r1 and r2 are alternate interior angles,
$\therefore\angle\text{r}_1=\angle\text{r}_2=40^\circ$
So, angle of refraction = 40º
Since, the emergent ray is parallel to the incidnt ray, the angle of emergent must be equal to angle of incidence, i.e.$\angle\text{e}=\angle\text{i}=55^\circ$

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