(N/A) When a bright light is focused on the eyes,the following sequence of events occurs in the reflex arc:
$1$. Photo receptors (in the retina of the eye) detect the stimulus (bright light).
$2$. Sensory neurons transmit the nerve impulse from the eye to the central nervous system (spinal cord/brain).
$3$. The relay neuron (interneuron) in the central nervous system processes the signal.
$4$. Motor neurons transmit the response signal from the central nervous system to the effector muscles.
$5$. The effector muscles (eyelid muscles) contract,causing the eye to blink.
Sequence: $\text{Photo receptors} \to \text{Sensory neuron} \to \text{Central nervous system} \to \text{Motor neuron} \to \text{Effector (eyelid muscles)} \to \text{Response (blinking)}$.