Question

# Two parallel slits $$0.6\ mm$$ apart are illuminated by light source of wavelength $$6000\overset{o}{A}$$. The distance between two consecutive dark fringes on a screen $$1\ m$$ away from the slits is

A
1 mm
B
0.01 mm
C
0.1 mm
D
10 m

Solution

## The correct option is A $$1\ mm$$Distance between two consecutive Dark fringes $$\beta=\dfrac {\lambda D}{d}$$$$=\dfrac {6000\times 10^{-10}\times 1}{0.6\times 10^{-3}}$$$$=1\times 10^{-3}m=1\ mm$$PhysicsNCERTStandard XII

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