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In a single-slit diffraction pattern, how does the angular width of central maximum change, when (i) slit width is decreased, (ii) distance between the slit and screen is increased, and (iii) light of smaller visible wavelength is used ? Justify your answer in each case. |
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Answer» Solution :We know that ANGULAR width of central maximum of diffraction pattern of a single-SLIT is given by `alpha=2theta=(2lamda)/(a)` (a) if slit width .a. is decreased, the angular width will increase because `alphaprop(1)/(a)`. (ii) Increase of distance between the slit and the screen does not affect the angular width of diffraction MAXIMA. (iii) If light of smaller VISIBLE wavelength is used, the angular width is decreased because `alphaproplamda.` |
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