The greater the average kinetic energy of the particles in a sample of matter, . the less energy released by the sample in the form of heat

the higher the temperature

the more energy absorbed by the sample in the form of heat

the lower the temperature

Light always follows the law of reflection, whether the reflection occurs off a curved surface or off a flat surface. The task of determining the direction in which an incident light ray would reflect involves determining the normal to the surface at the point of incidence. For a concave mirror, the normal at the point of incidence on the mirror surface is a line that extends through the center of curvature. Once the normal is drawn the angle of incidence can be measured and the reflected ray can be drawn with the same angle.