CBSE 2022 · Region 1 · Set 3 · Q6 · 3 marks
Using Huygen's principle, for a plane wavefront incident on a plane reflecting surface, draw the reflected wavefront. Hence prove laws of reflection.
Marking-scheme solution
$\displaystyle \Delta \mathrm{EAC}$ and $\displaystyle \Delta \mathrm{BAC}$ are congruent
(RHS congruency )
$\displaystyle \therefore \angle \mathrm{i}=\angle \mathrm{r}$
The plane of mirror is ⟂ to plane of paper hence the incident ray, reflected ray and normal ray lie in same plane.Wave OpticsRefraction and Reflection of Plane Waves using Huygens PrincipleApplyshort_answermedium
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CBSE Class 12 Physics past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.