October 2009
Intermediate to advanced
503 pages
14h 28m
English
Content preview from Engineering Physics
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14.8 Fraunhofer diffraction at double slit
The double slits have been represented as A1B1 and A2B2 in Fig. 14.11. The slits are narrow and rectangular in shape. The plane of the slits are perpendicular to plane of the paper. Let the width of both the slits be equal and it is ‘e’ and they are separated by opaque length ‘b’. A monochromatic plane wave front of wave length ‘λ’ is incident normally on both the slits.
Figure 14.11 Fraunhofer diffraction at double slits
Theory: Every point on the wave front in the slits will act as a source of secondary wavelets. The secondary wavelets travelling in the direction of OP0 are brought to focus at ...
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