Question

If a bright light falls over eyes, why a person is unable to see for a moment?

• A. Because bright light closes the pupil
• B. Because bright light does not stimulate the nerve impulse for a very short time
• C. Because bright light increases chemical break down in rods and cones which does not allow another visual impulse to pass for a moment
• D. Because bright light initiates the rhodopsin to dissociate for a moment

Answer 1

The correct option is D Because bright light initiates the rhodopsin to dissociate for a moment

Rhodopsin is a pigment-containing sensory protein which converts light into an electrical signal. It is located in the retina of the eyes particularly in the outer segment of the retina’s photoreceptive rod cells. These rod cells are adapted for vision under low-light conditions. This rhodopsin dissociates for a moment when bright light falls on the eyes and then adjusts in such a way that a person is able to see in dim light.