Question

what two optical phenomena make film possible?
○ persistence of vision & kinetic shading
○ optical drift & continuous exposure
○ cells of vision & photo illusion
○ persistence of vision & the phi phenomenon

Explanation:

Persistence of vision is the phenomenon where the human eye retains an image for a fraction of a second after the light source has been removed. This allows a sequence of still images (frames) to be perceived as a continuous motion. The phi phenomenon is a visual illusion that occurs when two or more adjacent lights are turned on and off in quick succession. The brain perceives the light as moving from one position to another. In film, a series of frames are projected in rapid succession (usually 24 frames per second). Due to persistence of vision, each frame lingers on the retina for a short time. The phi phenomenon helps in creating the illusion of smooth motion between the slightly different positions of objects in consecutive frames. Kinetic shading is related to how light and shadow change with movement in a 3 - D model (more in computer graphics). Optical drift is about the apparent movement of stationary objects (not relevant here). Cells of vision is not a standard optical phenomenon term for film. Photo - illusion is a very general term and not specific like the other two correct concepts.

Answer:

Persistence of vision & the phi phenomenon