Problem

If the first minima in a Young's slit experiment occurs directly in front of one of the slits. (distance between slit and screen

D = 12

cm and distance between slits

d = 5

cm) then the wavelength of the radiation used is : (a) 2 cm only (b) 4 cm only (c) 2 m,

\frac{2}{3}

cm,

\frac{2}{5}

cm (d) 4 cm,

\frac{4}{3}

cm,

\frac{4}{5}