Q. 9

The wave fronts of a light wave travelling in vacuum are given by x + y + z = c. The angle made by the direction of propagation of light with the X-axis is
A. 0°

B. 45o

C. 90o

D. cos-1(1/√3)

Answer :

The plane forms an equilateral triangle with the three axis. So the normal to this plane will make equal angles with all three axes. Let this angle be .

We know that the square sum of direction cosines is 1.




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