MCQ
If the angle between the normal to the planes is $\frac{\pi}{2}$, then
- A$\overline{ n }_1 \cdot \overline{ n }_2=1$
- ✓$\overline{ n }_1 \cdot \overline{ n }_2=0$
- C$\overline{ n }_1=\lambda \overline{ n }_2$
- D$\bar{n}_1-\bar{n}_2=0$
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