investigatory project for class 11 physics

= 2 S TI a in / 1) which initially gives a principal maximum is increased slightly, The observation can be explained as follows: suppose an angle (recall that B However, the maxima becomes sharper and more Observation The location of the maxima does notĭepend on the number of slits, N. If the wavelength of the light and the location of the m-order maximum are known,theĭistance between slits may be readily deduced. Thus, the condition for the principal maxima is given by If this pathĭifference is equal to an integral multiple of wavelengths then all the slits willĬonstructively interfere with each other and a bright spot will appear on the screen at anĪngle. Is 8 = similar to the calculation we made for the double-slit case. The relative path difference between each pair of adjacent slits DIFFRACTION GRATING A diraction grating consists of a large number ‘n’ of slits each of width ‘a’ and separated from the next by a distance ‘d’ Source, such as a laser, is used to observe diffraction, below are someĮxamples of diffraction patterns that are created by certain objects. Of light referred to as a diffraction pattern. When light diffracts off of the edge of an object, it creates a pattern Interfere, resulting in a pattern of dark and light

Spread around the edges of the obstruction and When parallel waves of light are obstructed by a very This is used in bright and dark field imaging. Of the diffraction pattern, the resulting image can be used to enhance

Since the individual sections (spots) of the diffraction patternĮach contain information, by forming an image from only particular parts InĬonventional image formation, a lens focuses the diffracted waves into an The pattern is equivalent to the reciprocal lattice of the object. Useful information on the symmetry of the mask. Diffraction patterns can be calculated by from aįunction representing the mask. Nature of the gap (or mask) which diffracts the

The nature of the diffraction pattern depends on the Interference between the light waves create a distinctive pattern (theĭiffraction pattern ) on the screen. If theĭiffracted light is projected onto a screen some distance away, then Gap width approaches the wavelength of the wave, the distortion becomesĮven more obvious. If theĪ wave passes through a gap, more obvious distortion can be seen. Passes a barrier, the waveform is distorted at the boundary edge. # To Study the Phenomenon of Diffraction of Light Arnav Sheelvantġ2th C INDEX 1 2 3 PATTERNS 4 SLIT DIFFRACTION 5 SLIT INTERFERENCE 6 GRATING 7

Investigatory project for class 11 physics