1. Assertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film. 2. Reason (R): An image formed on the retina of eye persists for about 0.1 s after the removal of stimulus.

1. Assertion (A): Motion pictures create the illusion of movement by projecting a rapid sequence of still images (frames). Projecting 24 frames per second is the standard frame rate for commercial film. So, Assertion (A) is true. 2. Reason (R): The human eye retains an image on the retina for a brief period after the stimulus is removed. This phenomenon is called persistence of vision. The duration is approximately 1/16th to 1/10th of a second (which includes 0.1 s). So, Reason (R) is true. 3. Explanation Check: The persistence of vision (Reason R) is the physiological basis for why a rapid sequence of frames (Assertion A) is perceived as continuous motion rather than flickering still images. The brain merges the slightly different consecutive images because each image persists briefly on the retina. Therefore, R is the correct explanation for A. 4. Conclusion: Both A and R are true, and R is the correct explanation of A.