A screen is placed 2m away from the lens to obtain the diffraction pa – McqOptions

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1.	A screen is placed 2m away from the lens to obtain the diffraction pattern in the focal plane of the lens in a single slit diffraction experiment. What will be the slit width if the first minimum lies 5 mm on either side of the central maximum when plane light waves of wavelength 4000 Å are incident on the slit?
A.	0.16 mm
B.	0.26 mm
C.	0.36 mm
D.	0.46 mm
Answer» B. 0.26 mm

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