Question

two component of solar cooker to increase the temperature inside

Answer 1

Mirror - Reflecting the solar energy onto the food.

Black paint - Absorbs more heat.

Glass/Plastic lid - traps Solar Energy.

Answer 2

covering the solar cooker with transparent glass sheet because glass sheet 
does not allow the heat from inside to escape the cooker.

applying black paint helps to absorb the heat the making the process of cooking faster