Light waves that cross from an air medium to a water medium will
A. O be focused into a straight line.
B. O
lose energy and dissipate.
C. O
change length and direction.
D. O
reflect off the water's surface.

C. change length and direction

Explanation:

The density of the material in which the light wave is travelling affects the speed of the wave. Different materials have different densities and they effect differently light waves which travel through them. Light waves may change direction at the boundary between two transparent materials, depending on material density. Density also impacts the speed of light. The denser the material, the slower light travels through it. The wavelength also decreases as light travels through the denser medium.

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers