The Wavefronts Of a light travelling in vaccum are given by x+y+z=c. The angle made by the direction of propagation of light with the X-axis is.

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The Wavefronts Of a light travelling in vaccum are given by x+y+z=c. The angle made by the direction of propagation of light with the X-axis is.

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The Wavefronts Of a light travelling in vaccum are given by x+y+z=c. T...

The given equation of the wavefronts represent a plane that intersects each of the axes at a distance c from the origin. Let these points be named A, B and C. ABC is an equilateral triangle of side c.

The direction of propagation of light will be normal to the plane. In this case, the normal makes equal angles with each of the axes say α. Since the sum of the squares of the direction cosines equals one, here for the normal cos^2α+cos^2α+cos^2α = 1

→3 cos^2α = 1

→cos^2α = 1/3

→cos α = 1/√3

→α = cos⁻^2 (1/√3)

Hence the option (d).

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The Wavefronts Of a light travelling in vaccum are given by x+y+z=c. The angle made by the direction of propagation of light with the X-axis is.

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