CBSE Class 10 Science 2019 · Paper 31/1/1 · Question 10
Trace the sequence of events which occur when a bright light is focused on your eyes.
Answer
Retinal receptors detect the light, a sensory neuron carries the impulse to the brain, and a motor neuron makes the pupil contract.
Bright light is detected by the receptor cells of the retina the impulse travels along the sensory neuron to the brain, which processes it a command travels along the motor neuron to the eye muscles (the muscles of the iris) the pupil contracts (becomes smaller) and the eyelids may blink or close, so less light enters the eye.
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