A slit of width `a` illuminated by red light of wavelength `6500 Å`. The first minimum will fall at `theta=30^(@)` if `a` is

A slit of width `a` illuminated by red light of wavelength `6500 Å`. The first minimum will fall at `theta=30^(@)` if `a` is
A. `3250 Å`
B. `6.5xx10^(-4) mm`
C. `1.3 micron`
D. `2.6xx10^(-4) cm`

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A slit of width `a` illuminated by red light of wavelength `6500 Å`. The first minimum will fall at `theta=30^(@)` if `a` is

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