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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