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  • A slit of width a is illuminated by white light. The first minimum for light of wavelength <img alt="3900 \mathrm{~A}^{0}" src="https://entrancecorner.oncodecogs.com/gif.latex?3900%20%5Cmathrm%7B%7

A slit of width a is illuminated by white light. The first minimum for light of wavelength 3900 \mathrm{~A}^{0} will fall at \theta=60^{\circ},if a is

Option: 1

3900 \mathrm{~A}^{0}


Option: 2

1950 \mathrm{~A}^{0}


Option: 3

7880 \mathrm{~A}^{0}


Option: 4

4503 \mathrm{~A}^{0}


Answers (1)

best_answer

For first minimum,

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

\mathrm{\Rightarrow \quad a=\frac{\lambda}{\sin \theta}=\frac{3900}{\sin 60} A^{0}=4503 A^{0}}

Posted by

manish painkra

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