A light wave is propagating with plane wave fronts of the type $x+y+z=$ constant. The angle made by

Question

A light wave is propagating with plane wave fronts of the type $x+y+z=$ constant. The angle made by the direction of wave propagation with the $x$-axis is\

Professor PC Thomas Classes · Answer

(a) : Wavefront $ightarrow x+y+z=$ constant Angle made by $x$-axis\ $\cos \alpha=\frac{1}{\sqrt{1^{2}+1^{2}+1^{2}}}=\frac{1}{\sqrt{3}}$\ $\alpha=\cos ^{-1}\left(\frac{1}{\sqrt{3}}ight)$\