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     EduGorilla 
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    A slit of width ‘a’ is illuminated by red light of wavelength 6500 . If the first minimum falls at θ = 30o, then the value of ‘a’ is

    Options :-

    1. 6.5 × 10-4 mm
    2. 1.3 micron
    3. 3250
    4. 2.6 × 10-4 cm
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