According to the laws of reflection a. \( \sin \mathrm{i} / \sin \mathrm{r}=\mathrm{constant} \)...

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According to the laws of reflection
a. \( \sin \mathrm{i} / \sin \mathrm{r}=\mathrm{constant} \)
b. \( \tan \mathrm{i}=\tan \mathrm{r} \)
c. angle \( \mathrm{i}= \) angle \( \mathrm{r} \)
d. All of these
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