PH 122 Lecture : Diffraction of Light
Document Summary
Resulting interference pattern with consist of a series of alternating light and dark bands. The width of the central bright band is twice the width of the other bright bands. w = 2 l a w width of the central band of light. L distance between the slit and the screen a width of the slit. Diameter of bright central maxima measured as distance from one side of the first dark ring to the other w = D w diameter of the central maxima of light. If measured width of second maxima, need to replace 2. 44 with 4. 47. If slits are very narrow compared to their separation, they can be considered point sources of spherical waves. Spherical waves interfere, produce a pattern of light and dark bands. With a grating, orders will be very well-defined points at well-specified angles dsin = m d grating spacing. Angle of order m order number.
