Which of the following is true about photoreceptors?
A) Three types of color-sensitive photoreceptors exist: red, green, and yellow.
B) If all cones are stimulated equally, all colors are absorbed by the cones and the color perceived is black.
C) Rods absorb light throughout the visual spectrum but confer only gray tone vision.
D) In dim light, images are focused directly on the rods in the fovea centralis.

Question

Quizplus · Accepted Answer

Rods absorb light throughout the visual spectrum but do not distinguish between different colors, resulting in black and white or gray tone vision. Option A is incorrect because there is no yellow photoreceptor; only red, green, and blue cones exist. Option B is incorrect because the cones do not absorb all colors equally and can distinguish between different hues. Option D is incorrect because in dim light, images are focused on the peripheral retina where the rods are more numerous, not on the fovea centralis.

Which of the Following Is True About Photoreceptors