Expiain the foliowing terms used in the display of $3$D objects:

a$)$ ambient light, b$)$ diffuse reflection, c$)$ specular reflection.

Indicate the physical quantities that affect the intensity of diffuse and specular reflection, if necessary illustrating these quantities in a diagram.

For a positional light, the attenuation of light received due to the distance from the light is considered. Explain the attenuation model implemented in graphics systems such as OpenGL.

$.$ Magnification and minification are used in texture mapping in computer graphics. Briefly explain these two concepts providing diagrams to aid your answer where necessary.