First slide

Diffraction

Question

Angular width of the central maxima in the Fraunhofer diffraction for
. When the same slit is illuminated by another monochromatic light, the angular width decreases by 30%. The wavelength of this light is,

Difficult

Solution

The angular width of the central maximum $θ \propto λ$
$\theta \,has\,\,a\,become\,\frac{{70\,\theta }}{{100}}\$
$\lambda \,\,has\,\,to\,\,become\,\,\frac{{70}}{{100}}\lambda \$
${\lambda ^1} = \frac{{70}}{{100}} \times 6000 = 4200{A^0}\$

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