8/6/2023 0 Comments Diffraction of light lab![]() Include a screen dump of this graph in your lab report. Adjustment of the slit size on the Light Sensor mask gives the resolution required to see detail in the interference patterns. Diffraction by a slit When a beam of light of wavelength arrives at a slit of width a, the diffracted light leaving the slit forms a pattern in space. Distance graph is plotted in real time, showing the connection between the intensity pattern and the actual laser pattern. PASCO Advantage: Since the Linear Translator tracks the position of the Light Sensor, it is not necessary to move the Light Sensor at a constant speed. Differences and similarities between interference and diffraction patterns are examined. We calculate the track spacing for the CD to be 1.5 m and the track spacing for the DVD to be 0.7 m and compare our results for the spacing. Using this information we will then determine the track spacing for a CD and DVD. These measurements are compared to theoretical values. Using the formula x L / d, we will determine the wavelength of a red laser to be 641nm. Also, the distances between interference maxima for two or more slits are measured. We will also measure the visible wavelength range by shining anincandescent light through the grating. The distances between the central maximum and the diffraction minima for a single slit are measured by scanning the laser pattern with a Light Sensor and plotting light intensity vs. In this lab we will be looking at the rst and second order diraction images of laser and measuring its wavelength. These patterns are then examined for similarities and differences. ![]() To measure wavelengths, we need a device that can split a beam of light up into different wavelengths. In each case, measurement of the distance between the dark fringes or bright fringes projected on the screen allows us to calculate the wavelength of the laser. Diffraction effects are important when the size of the opening is comparable to or less than the wavelength. Interference and diffraction patterns from laser light passing through various single-slits and multiple-slits are scanned and plotted in real time. The word diffraction refers to the spreading out of waves after passing through a small opening (Figure 1). ![]()
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