When light goes from a vacuum to some medium, such as water, its speed and wavelength change, but its frequency, f, remains the same. Thus, a diffraction grating becomes a multitude of parallel slit sources when. Light has wave characteristics in various media as well as in a vacuum. Analysis of Diffraction & Interference of Light Lab. A number of diffraction slits and gratings are provided with this setup. The scratches are opaque but the areas between the scratches can transmit light. monochromatic laser light passes through difference combinations of apertures. The device consists of one meter long optical bench with two transverse saddle for laser and slit mount and one transverse saddle with micrometer for detector. Light passing directly through the pinhole would seem to create a. The intensity versus distance curve is plotted on a graph for calculations. One interesting diffraction phenomenon occurs when light passes through a pinhole in a board. In the present setup, the light intensity in the terms of current or voltage is noted at closed intervals by finely traversing the detector movement and observing the light intensity on a digital multimeter. The intensity pattern can be determined using a pin photo detector with fine movement across the diffraction pattern. The intensity pattern on a screen due to diffraction through a double slit. To do this, relevant are the equations to determine the slit width and slit separation. Diffraction phenomenon of light can be observed when a laser beam passes through a diffraction slit. The purpose of this lab is to demonstrate the concepts of interference and diffraction in single and double slit experiments and to find the relationship between slit separation/width and the diffraction pattern.
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