Need only the final statment for this experiment Experiment 10: The Wavelength o

Question

Need only the final statment for this experiment Experiment 10: The Wavelength of Light Data Measu feasured with a Diffraction Grating Ca bright spectral line at this angl Over View: ions A diffraction grating c nsists of a glass plate on which closely spaced grooves have been You will be using a Final Statemenm ruled with a diamond. Total replica grating, in which the groove pattem from an original grating has been pressed into gelatin placed on a second plate of glass. Lab Instructor's Initials WARNING: THE GRATING SURFACE IS DELICATE AND EVEN LIGHTLY TOUCHING IT WITH A FINGER PRODUCES HARMFUL FINGERPRINTS WHICH CANNOT BE REMOVED: DO NOT TRY TO CLEAN THE GRATING SURFACE!!!! You must have your lab instructor initial this page before you leave lab. A grating may be considered as a large number of parallel slits with a common spacing d betwe adjacent slits. In this experiment it will be illuminated with parallel light normal to the grating surta e (see figure 1). Spectral lines, cach corresponding to a definite wavelength, are observed through a telescope focused at infinity. The vertical cross hair of this telescope is centered on light which leaves the grating as parallel rays at an angle to the normal. An image of the slit will of course be observed through the telescope when -0 (called the "zero order" or "central maximum"). Due to diffraction of the light passing through the narrow slits, however, light leavin the grating may also be seen at other angles. ijeht pasing throh he narrow its however, ligh lenving Diffraction Grating Collimator Telescope Slit Bench Source Eye figure 1 At a given angle (see figure 2), there is an optical path difference -d sin between rays f consecutive grooves difference is a multiple of a wavelength w (here d 001667 mm, since there are 600 lines/m m). om is a multiple of a wavelength which is present in the source, the amplitudes of the rays When this path

Explanation / Answer

Diffraction gratings diffract, or split, light periodically, meaning the light splits into several beams with a given angular separation. In this experiment, the first period, n=1, will be the brightest spot on the index card (besides the straight path of the laser, of course) after the grating splits the rays from the laser pointer. Using the formula, we can verify the wavelength of light using what the manufacturer of the laser pointer says it is. If the room is dark enough, we may even be able to measure the 2nd and 3rd periods and plug n = 2 and n = 3 into our equation, respectively. It should yield the same result.

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