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Q.

Two coherent light sources S1 and S2 (λ= 6000 Å) are 1mm apart from each other. The screen is placed at a distance of 25 cm from the sources. The width of the fringes on the screen should be

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a

0.015 cm

b

0.025 cm

c

0.010 cm

d

0.030 cm

answer is A.

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Detailed Solution

β=λDd=6000×10−10×25×10−210−3 =150000×10−9=0.15×10−3m=0.015cm

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