Q.

The distance between the first and the sixth minima in the diffraction pattern of a single slit is 0.5mm. The screen is 0.5m away from the slit. If wavelength of the light used is 5000 A0, then the slit width will be 

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a

2.5 mm

b

5 mm

c

1.25 mm

d

1.0 mm

answer is B.

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Detailed Solution

ayD=y2y1aD=λn2n1(a)0.5×1030.5=5000×1010[61]a=25×104m=2.5mm

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