Transcription of Diffraction grating - Physics Courses
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Diffraction grating - Physics Courses
DiffractionDiffraction gratingSingle slit diffractionCircular diffractionDiffraction and Interference Diffraction and interference are similar phenomena. Interference is the effect of superposition of 2 coherent waves. Diffraction is the superposition of many coherent grating Consists of a flat barrier which contains many parallel slits separated by a short distance d. A parallel monochromatic light beam passing through the grating is diffracted by an angle similar to two slit , the intensity of the diffracted light is higher andthe peaks are much narrower. dsin =m Diffraction gratingtwo slit interferencedmulti-slit interferenceDiffraction gratingdsin =m m=0m=1m=2m=-1m=-2m=0m=1m=2m=-1m=-2 Higher intensityQuestionA grating in a spectrometer has a length of 2 cm and has contains 104lines. Find the first order Diffraction angle for light with a wavelength of 500 order m=1dsin =m = == = 2642x10 m2x10 m10 ==L= cmN =104slitsLdN=Use of a Diffraction grating in a spectrometerDispersion of light of different wavelengths2 Optical compact disc10-6 mThe closely spaced dots act like a Diffraction slit diffractionbarriera For single slit Diffraction the complex behavior of the wave as a function of the aperture a is explained by interference between multiplecoherent point sources in the sourcesTwo Limiting CasesWave pictureLight spreads out when pass
y λ θ= = 0.41m 1.1m 1.22(550x10 m)(684x10 m) D 1.22 L y 9 3 = = λ = − Diffraction limit (λ=550nm) L y θ D Resolution limit of the eye θ min θ 2 The eye differs from a simple lens in air. 1. The light from the lens travels through a refractive media. 2. The light passing through the middle of the lens changes direction due to refraction. 3.
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