Question

what is an exposure meter and where is it located?

Explanation:

An exposure meter is a device used in photography to measure the amount of light. In - camera exposure meters are built - in to the camera body, usually near the viewfinder or in the light path of the lens. External exposure meters are handheld and can be used away from the camera for more precise light measurements in different locations.

Answer:

An exposure meter is a device for measuring light in photography. In - camera ones are in the camera body (e.g., near viewfinder or light path of lens), and external ones are handheld.