What happens when light moves from glass to air?

When light moves from a denser medium such as glass to a less dense medium like air, it increases its speed. This transition causes the light to bend away from the normal line, which is an imaginary line perpendicular to the surface at the point of incidence. This phenomenon is known as refraction.

The normal line is crucial in understanding the direction of bending; when light passes from glass (which has a higher refractive index) to air (which has a lower refractive index), it accelerates. According to Snell's law, the angle of refraction will be greater than the angle of incidence when moving to a less dense medium. Therefore, because the light is speeding up and bending away from the normal, the correct answer reflects this relationship.

In this context, absorption does not occur during this transition, and the light does not behave the same way when it enters a medium with a similar refractive index. Thus, the statement regarding the light speeding up and bending away from the normal when transitioning from glass to air accurately describes the behavior of light in this scenario.