Remove the Diffraction Plate and the Slit Mask and replace them with the Diffrac
ID: 1382418 • Letter: R
Question
Remove the Diffraction Plate and the Slit Mask and replace them with the Diffraction Grating. Look through the grating and observe the first order spectrum. NOTE: When looking through the Diffraction Grating avert your eye from looking straight at the filament. Instead, look at a position on the Diffraction Scale about 4 to 5 cm to the right or left of the slit in the scale. Using Figure 15.2 to identify the variables, fill in the data in Table 15.1. Review Experiment 9, if necessary, to determine the calculations needed to calculate lambda1 and lambda2, the range of wavelengths corresponding to each particular color of light. Compare your results with those of other students, or with textbook values, Are your results in complete agreement? Can you account for any discrepancies? What advantages are there in using wavelength rather than color to characterize visible light?Explanation / Answer
In interfreence or diffraction pattern,
the needed equation is Y = mLR/d---------------1
and d sin theta = mL--------------------2
where L = wavelgnth,
m = order = 1,2,3,4, ......... for brigth bands
m = 1.5, 2.5, 3.5, 4.5, ......for dark bands
R is the distance from slit to screen,
Y = disatnce from central spot to nth order fringe
part A:
1. this cannot be completely agreeed.
as there can be certain descrepencies that can be observed here as the wavelength is changed with that of monochromatic light
2. use of monochromatic wavelength enechances the intensity and directionality so that
rathen than any ordinary light