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Conditions of diffraction is
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The correct answer is:
$\frac{a}{\lambda} \leq 1$
For diffraction, the width $a$ of slit must be less than or comparable to wavelength of light used. i.e.,
$$
\frac{a}{\lambda} \leq 1
$$
$$
\frac{a}{\lambda} \leq 1
$$
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