In a Young's double-slit experiment the fringe width is 0.2 mm. If the wavelength of light used is increased by 10 % and the separation between the slits is also increased by 10 %, the fringe width will be

Question

In a Young's double-slit experiment the fringe width is 0.2 mm. If the wavelength of light used is increased by 10 % and the separation between the slits is also increased by 10 %, the fringe width will be (A) 0.20 mm (B) 0.401 mm (C) 0.242 mm (D) 0.165 mm

Tardigrade Admin · Accepted Answer

β=(λ D/d) ; If λ and d both increase by 10 %, there will be no change in fringe width (β).

Q. In a Young's double-slit experiment the fringe width is $0.2 mm$ . If the wavelength of light used is increased by $10%$ and the separation between the slits is also increased by $10%$ , the fringe width will be

0.20 mm

0.401 mm

0.242 mm

0.165 mm

$β = \frac{λ D}{d};$ If $λ$ and $d$ both increase by $10%$ ,
there will be no change in fringe width $(β)$ .

Q. In a Young's double-slit experiment the fringe width is 0.2mm. If the wavelength of light used is increased by 10% and the separation between the slits is also increased by 10%, the fringe width will be