Amirror works on the principle of a. refraction b. reflection, c.dispersion? and a lens works on the principle of a. refraction b. reflection c. dispersion?

reflection, refraction

Explanation:

When the ray of light falls on a highly polished and smooth surface, then after striking it bounce back into the same medium, this phenomenon is called reflection.

So, mirror works on the principle of reflection.

When a ray of light passes from one optical medium to another optical medium, it deviates from its path, this phenomenon is called refraction.

So, lens works on the principle of refraction.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.