What represents the concave mirror

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.