![]() ![]() Two Limiting Cases BarrierRay picturea> Light moves in a straight line Wave picturea<< Light spreads out when passedthrough small aperture. If the grating has 300 lines / mm then the spacing is 1 / 300,000m. In the transmissive case, the repetitive structure can be thought of as. ![]() The structure affects the amplitude and/or phase of the incident wave, causing interference in the output wave. You will need the value of d, spacing, i.e. Diffraction gratings, either transmissive or reflective, can separate different wavelengths of light using a repetitive structure embedded within the grating. ![]() The phasor approach accounts for the downward slope in the diffraction intensity (blue line) so that the peak near m=1 occurs at a value of θ ever so slightly smaller than we have shown here. Optical compact disc 10-6 m The closely spaced dots act like a diffraction grating. Use the formula d sin A wavelength to calculate the wavelength of green light. However, the diffraction grating equation gives the separation angle, which is the angle between the central zero maximum. The general grating equation may be written as n d(sin + sin s) where n is the order of diffraction, is the diffracted wavelength, d is the grating. ![]()
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