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The fringe width in a Young's double slit interference pattern is \( 3.2 \times 10^{-4} \mathrm{~m} \), when red light of wavelength \( 5600 \AA \) is used. How much will it change, if blue light of wavelength \( 4200 \AA \) is used?
(a) \( 8 \times 10^{-4} \mathrm{~m} \)
(b) \( 0.8 \times 10^{-4} \mathrm{~m} \)
(c) \( 4.2 \times 10^{-4} \mathrm{~m} \)
(d) \( 0.45 \times 10^{-4} \mathrm{~m} \)
\( \mathrm{P} \)
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