![]() Two Limiting Cases BarrierRay picturea> Light moves in a straight line Wave picturea<< Light spreads out when passedthrough small aperture. Also notice that the maximum intensity of the double slit is 4 units, the 3-slit case has a maximum intensity of 9 units, and for 4-slits it is 16 units, as we expect when the amplitude increases by one unit with the addition of each slit. 10-6 m The closely spaced dots act like a diffraction grating. Apparatus Spectrometer, diffraction grating element and mercury vapor lamp. The central maximum is white, and the higher-order maxima disperse white light into a rainbow of colors. ![]() (b) The pattern obtained for white light incident on a grating. To calculate the wavelength of the other prominent lines of mercury by normal incidence method. (a) Light passing through is diffracted in a pattern similar to a double slit, with bright regions at various angles. Notice that the bright fringes for any number of slits occur at the same places as for the double slit (provided they have the same slit separation), and that the number of dark fringes between bright fringes goes up by one every time another slit is added. To determine the number of lines per millimeter of the grating using the green line of the mercury spectrum. When the light from different slits meet at the screen, the waves will interfere and the resultant amplitudes (determined by superposition) will give pattern on the screen. As different wavelengths leave the grating at different angles, they form a spectrum, or diffraction, order. ![]() Putting these functions into a graphing calculator confirms what we found above, as well as what we suspect about \(n\) slits – that there are \(n-1\) dark fringes between each maximally-bright fringe.įigure 3.3.3 - Comparison of Interference Patterns by Number of Slits and this is known as the DIFFRACTION GRATING EQUATION. When light passed through the slits in a grating for example, it is diffracted.spreads out towards the screen. ![]()
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