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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 :

1. cos –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 3 2
2. cos –1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 3 1
3. cos –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 3 1
4. cos –1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 3 2

Correct answer: cos –1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 3 1

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