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Q.

A single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. if the second and fourth minima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum? (i.e., distance between first minimum on either side of the central maximum)

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a

1.5 cm

b

4.5 cm

c

3.0 cm

d

6.0 cm

answer is C.

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Detailed Solution

Width of each secondary maxima = 12(6-3) cm = 1.5 cm

Therefore width of central maxima = 2 ×1.5 cm = 3 cm

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