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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
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B
0.01 mm
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C
0.1 mm
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D
10 m
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Solution

The correct option is A $$1\ mm$$
Distance between two consecutive Dark fringes 
$$\beta=\dfrac {\lambda D}{d}$$

$$=\dfrac {6000\times 10^{-10}\times 1}{0.6\times 10^{-3}}$$

$$=1\times 10^{-3}m=1\ mm$$

Physics
NCERT
Standard XII

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