Loss of paint in the cavity (the cooking area) of a microwave oven isn't a safety problem unless that spot is rusting and has rusted through. That will leave a hole in the cavity, and that is a safety problem.
You can't. Only if it's a microwave-oven
A convection oven moves the air, a microwave does not.
compare microwave oven to conventional oven
The GE Profile Countertop Microwave Oven is 13-7/8" tall, 24" wide, and has a depth of 19-1/2" with an interior capacity of 2.2 cubic feet.
Microwave oven
There are no famous microwave oven commercials. There were a lot of commercials for microwave ovens in the 1970s, but none stood out as famous. This question probably should have asked what a commercial microwave oven is. A commercial microwave oven is a microwave oven used by restaurants and cafeterias.
The purpose of the light in a microwave oven is to enable the user to observe the progress of the cooking, and to serve as another indication ... in addition to the sound of the fan ... of when the oven is energized. The light is only a convenience, and has no effect on the operation of the appliance.
Most food items cooked in a microwave cooker are actually steam cooked by steam generated from water in the interior. This steam permeates the food cooking both the interior and exterior at about the same time.
If you mean the microwave and OVEN , then it does have microwave oven and also electrical heating oven capability.
A convection oven moves the air, a microwave does not.
Microwave oven
a microwave