Which of the following structures are the sensory receptor cells active in dim light?
A) cones
B) lens
C) rods
D) optic disk
C
Explanation: Rods are active in dim light. Cones are active in bright light. The lens focuses light rays onto the retina. The optic disk is where the retinal blood vessels enter and exit the eyeball and where the optic nerve leaves the eyeball.
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