Where do the three rays in a ray diagram start? a.) at a focal point on the opposite side of the lens b.) at three different points on the object c.) at a focal point on the same side of the lens d.) at a single point on the object

D.) at a single point on the object

The three rays in a ray diagram start from a single point on the object.

The three rays are called the the principal rays that are used to determine the location and the size of the image. These are;

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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