JEE Main20252 Apr 2025Morning ShiftPhysicsWave OpticsActual
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:
Options
- A⁻¹ ( 1 3 )
- B⁻¹ ( 2 3 )
- C⁻¹ ( 1 3 )
- D⁻¹ ( 2 3 )
Correct answer
A. ⁻¹ ( 1 3 )
Step-by-step solution
The direction of propagation of light is perpendicular to the wave front and is symmetric about x , y and z axis. Angle made by the light with x , y & z axis is same. = = ( , & are angle made by light with x , y & z axis respectively) Also ^2 + ^2 + ^2 =1 [Sum of direction cosines] = ⁻¹ 1 3