These are the options for the question :According to Huygens principle, the amplitude of secondary wavelets is
(A) equal in both the forward and the backward directions.
(B) maximum in the forward direction and zero in the backward direction.
(C) large in the forward direction and small in the backward direction.
(D) small in the forward direction and large in the backward direction
The correct answer is -According to Huygens principle, each point on a wavefront acts as a source of secondary wavelets, and the amplitude of these secondary wavelets is proportional to the amplitude of the original wavefront. However, the amplitude of the secondary wavelets is not necessarily the same in all directions.
Option (A) is not always correct, as the amplitude of the secondary wavelets may differ in the forward and backward directions depending on the shape and nature of the wavefront and the medium.
Option (B) is not correct, as the amplitude of the secondary wavelets is not zero in the backward direction. The amplitude of the secondary wavelets decreases with distance from the source, but it does not become zero.
Option (C) and (D) are also not always correct, as the amplitude of the secondary wavelets depends on the geometry and shape of the wavefront, and it may not be the same in all directions.
Therefore, none of the given options is entirely correct.
