Advertisements
Advertisements
प्रश्न
According to Huygens’s principle, the amplitude of secondary wavelets is ______.
विकल्प
equal in both the forward and the backward directions.
maximum in the forward direction and zero in the backward direction.
large in the forward direction and small in the backward direction.
small in the forward direction and large in the backward direction.
Advertisements
उत्तर
According to Huygens’s principle, the amplitude of secondary wavelets is maximum in the forward direction and zero in the backward direction.
Explanation:
According to Huygens’s principle, every point on a wavefront acts as a source of secondary wavelets that spread out in all directions with the same speed as the original wave.
However, in practice:
- The amplitude of secondary wavelets is maximum in the forward direction (the direction of wave propagation).
- It is zero in the backward direction, meaning no wave travels backward.
This is because the backward wavelets interfere destructively, and the forward wavelets combine constructively to form the new wavefront.
संबंधित प्रश्न
On the basis of Huygens' wave theory of light prove that velocity of light in a rarer medium is greater than velocity of light in a denser medium.
What is the shape of the wavefront in the following case?
Light diverging from a point source.
What is the shape of the wavefront in the following case?
Light emerging out of a convex lens when a point source is placed at its focus.
You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.
Consider a plane wave front incident on a thin convex lens. Draw a proper diagram to show how the incident wave front traverses through the lens and after refraction focusses on the focal point of the lens, giving the shape of the emergent wave front.
State Huygens’s principle. Show, with the help of a suitable diagram, how this principle is used to obtain the diffraction pattern by a single slit.
Draw a plot of intensity distribution and explain clearly why the secondary maxima becomes weaker with increasing order (n) of the secondary maxima.
Light waves travel in vacuum along the X-axis. Which of the following may represent the wave fronts?
A plane wave front AB propagating from denser medium (1) into a rarer medium (2) is incident on the surface P1P2 separating the two media as shown in fig.
Using Huygen’s principle, draw the secondary wavelets and obtain the refracted wave front in the diagram.
Wavefront means
Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of maxima and minima ______.
