The wavefront of a light beam is given by

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

x+2y+3z=c

, where

c

is an arbitrary constant. The angle made by the direction of light with the

y

-axis is: (a)

\cos^{-1}\frac{1}{\sqrt{14}}

(b)

\cos^{-1}\frac{2}{\sqrt{14}}

(c)

\sin^{-1}\frac{1}{\sqrt4}

(d)

\sin^{-1}\frac{2}{\sqrt4}