Light waves travel in vacuum along the X-axis. Which of the following may represent the wavefronts ?

Monjur Alahi

Light waves travel in vacuum along the X-axis. Which of the following may represent the wavefronts ?

(a) x = c.

(b) y = c.

(c) z = c.

(d) x + y + z = c.


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Salim Ahmed Kawsar

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The correct answer is (a) x = c.

EXPLANATION:  

 The wavefronts are perpendicular to the direction of the light. Since here the light is traveling along X-axis, the wavefront will be a plane perpendicular to the X-axis. Out of the four options only (a) represents a plane perpendicular to X-axis.

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