![]() If the yellow light is replaced by X-rays, then the pattern will revealĪnswer: D. Q2. Yellow light is used in single slit experiment with slit width 0.6 mm. The width of central maxima is the distance between the two minima = dα, where d is the distance between slit and screen = 1m. Here the lens diameter would act as slit width. The angle subtended by two minima in the slit = α = 2λ/w, where w is the slit width. In a single slit diffraction λ= 500mmwith and a lens of diameter 0.01mm, width of central maxima, obtain on screen at a distance of 1 m will beĪnswer: C. On either side of central maxima, there is bright zone i.e 1st maxima.ĭownload Wave Optics Cheat Sheet by clicking on the button belowĪn image is formed at an infinite distance. The zone which we get in front of the slit is the central maxima. ![]() So in order to make these rays parallel to focus on the screen, we, make use of the converging lens. But why do we use the lens? Because in Fraunhofer diffraction, the source is at infinity so the rays of light which pass through the slit are parallel rays of light. But when the source and the screen are far away from each other, and when the source is located at the infinite position, then the ray of light coming from that infinite source are parallel rays of light. So the light bends a little and meets the screen.Ī beam of width α travels a distance of α2/λ, called the Fresnel distance before it starts to spread out due to diffraction. Here, if suppose the ray of light comes exactly at the edge of the obstacles, the path of the light is changed. The source and the screen are not very far from each other. Example of diffraction in nature is diamond rays in the solar eclipse.įrom the above figure, we observe that the source is located at a finite distance from the slit, and the screen is also at a finite distance from the slit. At times diffraction of sunlight in clouds produces a multitude of colors. Reflected light produces fridges of light, dark or colored bands. It is the bending of light around the corner of an obstacle. Every one of us knows what diffraction is. ![]()
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