The eye of a human can distinguish
-
550 shades of the gray
-
450 shades of the gray
-
600 shades of the gray
-
500 shades of the gray
D
Correct answer
Explanation
The human eye can distinguish approximately 500 shades of gray, making option D correct. This is a well-established fact in human visual perception - the eye can detect subtle differences in luminance across this range.