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A Transverse wave propagates at 90 degrees to the direction the amplitude increases In other words the wave oscillates up and down yet moves from left to right! this is different from a longitudinal wave, which oscillates in the same direction as it moves
Lines that meet at a right angle, as in a transverse wave, are perpendicular to each other. In a transverse wave, the oscillations of the wave occur perpendicular to the direction of energy propagation. This characteristic of transverse waves allows for the wave to exhibit properties such as polarization, where the oscillations are confined to a single plane.
Refraction
Because a right angle is a right angle.
Assuming your question is what makes a right-angle, it is an angle of 90o .