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प्रश्न
According to Huygens’s principle, the amplitude of secondary wavelets is ______.
पर्याय
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.
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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
Using Huygens's construction of secondary wavelets explain how a diffraction pattern is obtained on a screen due to a narrow slit on which a monochromatic beam of light is incident normally.
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.
Using Huygens’ principle, verify the laws of reflection at a plane surface.
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.
What is the geometrical shape of the wavefront for:
- Light diverging from a point source?
- The pattern of wavefront of the light from a distant star intercepted by earth?
Figure shows a standard two slit arrangement with slits S1, S2, P1, P2 are the two minima points on either side of P (Figure). At P2 on the screen, there is a hole and behind P2 is a second 2-slit arrangement with slits S3, S4 and a second screen behind them.
Is Huygen’s principle valid for longitudinal sound waves?
Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final image?
Represent diagrammatically how the incident planar wavefronts of wavelength λ pass through an aperture of size d, when d is approximately equal to λ.
