Barbara places an object in front of a mirror. the mirror produces an image that is inverted, real, and smaller than the object. which kind(s) of mirror could barbara be using? convex, because concave and plane mirrors produce only virtual images concave, because plane and convex mirrors produce only upright virtual images concave or convex, because both types of mirrors produce images that are inverted and real convex or plane, because both types of mirrors produce an image that is smaller than the object

Concave mirror

Plane mirrors, convex mirrors, and diverging lenses can never produce a real image. A concave mirror and a converging lens will only produce a real image if the object is located beyond the focal point therefore if the image Barbara is looking at is  inverted, real, and smaller than the object then obviously she is using a concave mirror

B. Concave, because place and convex mirrors produce only upright virtual images.

Explanation:

where’s the list ? the question is incomplete

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia