Complete the following table with the help of the extract:
Give one merit and one demerit of ‘Love’ and ‘Patience’.
According to the passage, love is valuable in private life but ineffective in public affairs. On the other hand, patience helps in handling conflicts but could sometimes result in stagnation if taken to extremes.
Explain the construction of a spherical wavefront by using Huygens' principle.
The slope of the tangent to the curve \( x = \sin\theta \) and \( y = \cos 2\theta \) at \( \theta = \frac{\pi}{6} \) is ___________.