Question

1 Huygens principle tells us that each point on a wavefront is a source
of secondary waves, which add up to give the wavefront at a later time.
2. Huygens construction tells us that the new wavefront is the forward
envelope of the secondary waves. When the speed of light is
Independent of direction, the secondary waves are spherical. The rays
are then perpendicular to both the wavefronts and the time of travel​

Answer 1

Answer:

Friendship is one of the greatest blessings that not everyone is lucky enough to have. We meet a lot of people in the journey of life but there are only a few who leave a mark on us. My best friend is one such person who has been able to make a positive impact on my life. We have been a part of each other’s lives for the longest time and our friendship is still developing. Most importantly, I feel extremely fortunate to have someone as a best friend in my life. In this essay on my best friend, I will tell you about how we became friends and about her best qualities.

Explanation:

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Answer 2

Answer:

thanks for giving me free points