There are many double slits not one . And the interference image is total of many double slits. How to know the direction of interference?andrevdh said:
The question asks about crests of constructive interference. In post #7 I should have been more specific and asked which of the 4 points is located on a crest of constructive interference. Only one of the points a, b, c, d is such a point.Hamal_Arietis said:
Is c right ?Intially I think your blue lines is the direction of the incident. so I choose bTSny said:
Yes, point c is a point where crests are constructively interfering. You want to find the direction in which point c moves as the waves propagate. Draw the figure as shown. On the same figure, draw the waves as they would appear a little later in time.Hamal_Arietis said:
The Huygens-Fresnel principle is a fundamental concept in wave optics that explains the behavior of light as it propagates through a medium. It states that every point on a wave front can be considered as a source of secondary wavelets, and the sum of these secondary wavelets determines the shape and direction of the new wave front.
The principle was first proposed by Dutch physicist Christiaan Huygens in the late 17th century, and later refined by French physicist Augustin-Jean Fresnel in the early 19th century.
The Huygens-Fresnel principle is a key concept in understanding the behavior of light and other waves in various mediums. It provides a mathematical framework for predicting how waves will propagate and interact with obstacles, and has many practical applications in fields such as optics, acoustics, and electromagnetism.
The Huygens-Fresnel principle can be used to explain the phenomena of diffraction and interference, which are important in understanding the behavior of light and other waves. Diffraction occurs when a wave passes through an opening or around an obstacle, causing it to spread out and create a diffraction pattern. Interference occurs when two or more waves overlap and either reinforce or cancel each other out. The Huygens-Fresnel principle can be used to mathematically predict the patterns created by these phenomena.
While the Huygens-Fresnel principle is a powerful tool for understanding the behavior of waves, it does have some limitations. It is based on certain assumptions, such as the wave nature of light and the absence of absorption, which may not always hold true in real-world situations. Additionally, the principle is most accurate for waves with small amplitudes and in homogeneous mediums, and may not accurately predict the behavior of waves in more complex systems.
