At a film shooting, director Colby Lopez tells his rookie assistant director to get rid of all the “practicals” in the frame. However, the assistant director is not sure of what Lopez is talking about. To what does the term “practical” refer in film production?

A.
the main light used for a scene
B.
the key light used for a scene
C.
the backlight used for a scene
D.
any light source appearing in a scene

D.  any light source appearing in a scene

Explanation:

Traditionally, any light source that appears in the frame of a shot is the practical lighting and any other lighting used to light  that scene is the 'film' light specifically put in to suit the cinematographer's needs.

The practical lights are built into the frame and appear natural to the setting of the shot. For example: a drawing room shot would have a lamp and a hanging bulb to light it.

Sometimes, directors use them extensively, or even exclusively. Other times, they rely on artificial film lights and go away with practicals from the shot.

D. any light source appearing in a scene

Explanation:

I got it right in a test.

answer; thinker;

the correct answer would be "the amiens cathedral"