$(a)\;300\;nm \\ (b)\;600\;nm \\ (c)\;both \;a\; and\; b \\ (d)\;None $

$\Delta P= \large\frac{yd}{D}$

$\qquad= 900 nm$

for minima $\Delta P = \large\frac{(2n-1) \lambda}{2}$

=> $\lambda =\large\frac{2 \Delta P}{(2n-1)}=\frac{1800}{2n-1}$

$\qquad=\large\frac{1800}{1} , \frac{1800}{3}, \frac{1800}{5}, \frac{1800}{7}$

of these $600,360\;nm$ lie in visible region.

Hence these will be missing lines in the visible spectrum.

Hence c is the correct answer.

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