Question

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 4 m away. The distance between the first dark fringes on either side of the central bright fringe is ______.

पर्याय

• 1.2 mm

• l.2 cm

• 4.8 cm 

• 4.8 mm

Answer 1

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 4 m away. The distance between the first dark fringes on either side of the central bright fringe is  4.8 mm.

Explanation:

Distance between the first dark fringes on either side of central maxima = width of central maxima= `(2lambda"D")/"d" = (2xx 600 xx 10^-9 xx 4)/(1 xx 10^-3)` = 4.8 mm