Name: 蜃気楼とは？| 蜃気楼とは？ (What is a mirage? | #aumsum)
Uploaded: 2021-01-14T08:10:37.000Z
Duration: 1 min 4 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Mirage is an illusion in which it appears
as if there is water present on the ground.

On a hot day, the land heats the layers of
air closer to it.

However, as we move higher, the layers of
air get relatively cooler.

Thus, the hot lower layers of air near the
ground form rarer media.

Now, when light coming from sky travels from denser to rarer media.

It bends more and more until it exceeds the critical angle.

i.e.the angle beyond which light gets reflected.

This phenomenon is called total internal reflection.

When this reflected light reaches our eyes,
our eyes trace it backward as a straight line.

Hence, the reflection of blue sky appears
on the ground.

Our brain thinks that there is water, thus causing a mirage.