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  •  Light of wavelength  is incident normally on a slit. First minimum of diffraction pattern is for

 Light of wavelength 5000 \AA  is incident normally on a slit. First minimum of diffraction pattern is formed at a distance of 5 \mathrm{~mm} from the central maximum. If slit width is 0.2 \mathrm{~mm}, then distance between slit and screen will be

Option: 1

1 \mathrm{~m}


Option: 2

1.5 \mathrm{~m}


Option: 3

2.0 \mathrm{~m}


Option: 4

2.5 \mathrm{~m}


Answers (1)

best_answer

\mathrm{a} \sin \theta=\mathrm{n} \lambda

\mathrm{\text { or } a \cdot \frac{x}{D}=n \lambda}
\mathrm{D=\frac{a x}{n \lambda}=\frac{2 \times 10^{-4} \times 5 \times 10^{-3}}{1 \times 5000 \times 10^{-10}}=2.0 \text { metre }}

Posted by

Rishabh

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