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$i=0,3\,.\,{{10}^{-3}}\,\,\left( m \right)$
$D=1,2\,\,\left( m \right)$
$a=0,2\,.\,{{10}^{-3}}\,\,\left( m \right)$
$\lambda =?$
…………………………
$\lambda =\dfrac{a\,.\,i}{D}=\dfrac{0,2\,.\,{{10}^{-3}}\,.\,0,3\,.\,{{10}^{-3}}}{1,2}=0,05\,.\,{{10}^{-6}}\,\,\left( m \right)=0,05\,\,\left( \mu m \right)$
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