Correct Option
Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
Assertion (A) states that in a motion picture, typically 24 frames are projected every second. This is a factually correct statement regarding the standard frame rate used in cinema to create the illusion of continuous motion.
Reason (R) states that an image formed on the retina of the eye persists for approximately 0.1 seconds after the removal of the stimulus. This phenomenon is known as persistence of vision. It is a physiological characteristic of the human eye.
The persistence of vision (R) is precisely why projecting 24 frames per second (A) creates the perception of continuous movement. If the frames were projected at a slower rate, the individual frames would be discernible, and the illusion of motion would be lost. The brain interprets the rapid succession of slightly different images as continuous motion due to the retinal persistence.
Incorrect Options
Option 2 is incorrect because while both A and R are true, R is indeed the correct explanation for A. The phenomenon of persistence of vision directly underpins the technical standard of frame rates in motion pictures.
Option 3 is incorrect because both Assertion (A) and Reason (R) are factually correct statements. The standard frame rate in cinema is 24 frames per second, and the persistence of vision is a known physiological characteristic of the human eye.
Option 4 is incorrect because Assertion (A) is true. The standard frame rate for motion pictures is indeed 24 frames per second. Reason (R) is also true, describing the persistence of vision.