JEE MAIN - Physics (2022 - 29th June Morning Shift - No. 17)
Using Young's double slit experiment, a monochromatic light of wavelength 5000 $$\mathop A\limits^o $$ produces fringes of fringe width 0.5 mm. If another monochromatic light of wavelength 6000 $$\mathop A\limits^o $$ is used and the separation between the slits is doubled, then the new fringe width will be :
0.5 mm
1.0 mm
0.6 mm
0.3 mm
Explanation
Fringe width = $${{\lambda D} \over d}$$
$$\Rightarrow$$ Fringe width $$\propto$$ $${\lambda \over d}$$
$$\Rightarrow$$ New fringe width = 0.5 mm $$ \times {{1.2} \over 2} = 0.3$$ mm
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