The example of antithesis from the extract is:
"One shade the more, one ray the less," This line presents a contrast between "shade" (darkness) and "ray" (light), highlighting the balance of opposites in the lady's beauty. The poet uses this contrast to emphasize that even a slight change in balance would affect the perfection of her beauty.
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 ___________.