Find the video URL and watch the video. Then, provide answers for the following questions and submit them (online submission) (1) Explain the refractive index distribution on the ground of desert. Is the refractive index of air near the ground higher or lower than that of upper air? (2) Explain what he sees on the surface of desert when the observer is far from the tree in the video. (3) What is the role of total internal reflection in the mirage effect?

https://www.youtube.com/watch?v=geDnCu78dvE