Red light of wavelength `6500 Å` from a distant source falls on a slit `0.50 mm` wide. Calculate the distance between first two dark bands on each side of central bright band in the diffraction pattern observed on a screen placed `1.8 m` from the slit.
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Here, `lambda = 6500 Å = 6.5 xx 10^(-7)m, a = 0.50 mm = 5 xx 10^(-4)m, D = 1.8 m` Distance between first two dark bands on each side of central maximum is the width of central maximum i.e., `2x = (2 lambda D)/(a) = (2 xx 6.5 xx 10^(-7) xx 1.8)/(5 xx 10^(-4)) = 4.68 xx 10^(-3)m`
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