There are several applications.
Light, in common with other electromagnetic radiation, is propagated in waves. These waves follow a sine (or cosine) curve.
Light is reflected off a smooth surface at the same angle as the incident light.
Refraction of light is governed by Snell's law. According to the law, the ratio of the sines of the angle of incidence and the angle of refraction is equal to the inverse of the ratio of the refractive indices of the two media.
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Electromagnetic radiation is propogated as sine waves.
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For navigational purposes
For navigational purposes
Optics deals with light waves, and all waves relate in some way to trigonometry. Also, the reflection and refraction of light involves trigonometry.