No, a standard microwave oven cannot be made transparent. Microwave ovens are designed with a solid metal casing and a metal mesh or screen on the door, which serves two important purposes:
Safety: The metal casing and mesh on the door act as a Faraday cage, which contains the microwaves generated inside the oven. This prevents the microwaves from leaking out and potentially causing harm to people nearby.
Shielding: The metal mesh on the door also serves as a shield, preventing the microwaves from escaping while allowing you to see inside. The size of the holes in the mesh is designed to be much smaller than the wavelength of the microwaves, effectively reflecting them back into the oven.
If you were to remove the metal casing or make the door transparent, it would compromise the safety of the microwave oven by allowing microwaves to escape, which can be dangerous. It's important to remember that microwaves are a form of electromagnetic radiation, and exposure to high levels of microwaves can cause burns, eye damage, and other health hazards.
So, for safety reasons, microwave ovens are not designed to be transparent.