- Derive Snell's law on the basis of Huygen's wave theory when light is travelling from a denser to a rarer medium.
- Draw the sketches to differentiate between plane wavefront and spherical wavefront.
CBSE OUTSIDE DELHI - SET 2 NORTH 2016
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We have BC $ = \vartheta_{1}\tau\text{ and }\text{AE} = \vartheta_{2}\tau$
Also $\sin\text{i} = \frac{\text{BC}}{\text{AC}}\text{ and } \sin\text{r} = \frac{\text{AE}}{\text{AC}}$
$\therefore\frac{\sin\text{i}}{\sin\text{r}} = \frac{\text{BC}}{\text{AE}} = \frac{\vartheta_{1}}{\vartheta_{2}} = \frac{\text{n}_{2}}{\text{n}_{1}}$
= a constant
This is Snell’s law.
- Plane wavefront:
Spherical wavefront:
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